Alberic Jaulin, Laurent Bigue, and Pierre Ambs, “High-speed degree-of-polarization imaging with a ferroelectric liquid-crystal modulator,” Opt. Eng. 47, 033201 (2008).

[CrossRef]

P. Zhai, G. W. Kattawar, and P. Yang, “Impulse response solution to the three-dimensional vector radiative transfer equation in atmosphere-ocean systems. I. Monte Carlo method,” Appl. Opt. 47, 1037-1047 (2008).

[CrossRef]
[PubMed]

J. Zallat, C. Collet, and Y. Takakura, “Clustering of polarization-encoded images,” Appl. Opt. 43, 283-292 (2004).

[CrossRef]
[PubMed]

B. Laude-Boulesteix, A. De Martino, B. Drévillon, and L. Schwartz, “Mueller polarimetric imaging system with liquid crystals,” Appl. Opt. 43, 2824-2832 (2004).

[CrossRef]
[PubMed]

D. M. Winker, W. H. Hunt, and C. A. Hostetler, “Proceedings of laser radar techniques for atmospheric sensing,” Proc. SPIE 5575, 8-15 (2004).

[CrossRef]

G. Yao, “Differential optical polarization imaging in turbid media with different embedded objects,” Opt. Commun. 241, 255-261 (2004).

[CrossRef]

G. W. Kattawar and M. J. Raković, “Virtues of Mueller matrix imaging for underwater target detection,” Appl. Opt. 38, 6431-6438 (1999).

[CrossRef]

M. J. Raković, G. W. Kattawar, M. Mehrubeoglu, B. D. Cameron, L. V. Wang, S. Rastegar, and G. L. Cote, “Light backscattering polarization patterns from turbid media: theory and experiment,” Appl. Opt. 38, 3399-3408 (1999).

[CrossRef]

L. Roberti and C. Kummerow, “Monte Carlo calculations of polarized microwave radiation emerging from cloud structures,” J. Geophys. Res. 104, 2093-2104 (1999).

[CrossRef]

X. Gan, S. P. Schilders, and M. Gu, “Image enhancement through turbid media under a microscope by use of polarization gating methods,” J. Opt. Soc. Am. A 16, 2177-2184 (1999).

[CrossRef]

K. F. Evans, “The spherical harmonic discrete ordinate method for three-dimensional atmospheric radiative transfer,” J. Atmos. Sci. 55, 429-446 (1998).

[CrossRef]

M. J. Raković and G. W. Kattawar, “Theoretical analysis of polarization patterns from incoherent backscattering of light,” Appl. Opt. 37, 3333-3338 (1998).

[CrossRef]

B. D. Cameron, M. J. Raković, M. Mehrubeoglu, G. W. Kattawar, S. Rastegar, L. V. Wang, and G. L. Cote, “Measurement and calculation of the two-dimensional backscattering Mueller matrix of a turbid medium,” Opt. Lett. 23, 485-487 (1998).

[CrossRef]

E. P. Zege and L. I. Chaikovskaya, “New approach to the polarized radiative transfer problem,” J. Quant. Spectrosc. Radiat. Transfer 55, 19-31 (1996).

[CrossRef]

S. K. Gayen and R. R. Alfano, “Emerging optical biomedical imaging techniques,” Opt. Photonics News 7, 17-22 (1996).

[CrossRef]

F. Weng, “A multi-layer discrete-ordinate method for vector radiative transfer in a vertically-inhomogeneous, emitting and scattering atmosphere-I. theory,” J. Quant. Spectrosc. Radiat. Transfer 47, 19-33 (1992).

[CrossRef]

F. Weng, “A multi-layer discrete-ordinate method for vector radiative transfer in a vertically-inhomogeneous, emitting and scattering atmosphere II. Application,” J. Quant. Spectrosc. Radiat. Transfer 47, 35-42 (1992).

[CrossRef]

D. M. O'Brien, “Accelerated quasi Monte Carlo integration of the radiative transfer equation,” J. Quant. Spectrosc. Radiat. Transfer 48, 41-59 (1992).

[CrossRef]

L. Wang, P. P. Ho, G. Liu, G. Zhang, and R. R. Alfano, “Ballistic 2-D imaging through scattering wall using an ultrafast Kerr gate,” Science 253, 769-771 (1991).

[CrossRef]
[PubMed]

R. D. M. Garcia and C. E. Siewert, “A generalized spherical harmonics solution for radiative transfer models that include polarization effects,” J. Quant. Spectrosc. Radiat. Transfer 36, 401-423 (1986).

[CrossRef]

C. Cox and W. Munk, “Statistics of sea surface derived from sun glitter,” J. Mar. Res. 13, 198-227 (1954).

L. C. Henyey and J. L. Greenstein, “Diffuse radiation in the galaxy,” Astrophys. J. 93, 70-83 (1941).

[CrossRef]

J. H. Ali, W. B. Wang, P. P. Ho, and R. R. Alfano, “Detection of corrosion beneath a paint layer by use of spectral polarization optical imaging,” Opt. Lett. 25, 1303-1305 (2000).

[CrossRef]

S. G. Demos and R. R. Alfano, “Optical polarization imaging,” Appl. Opt. 36, 150-155 (1997).

[CrossRef]
[PubMed]

S. K. Gayen and R. R. Alfano, “Emerging optical biomedical imaging techniques,” Opt. Photonics News 7, 17-22 (1996).

[CrossRef]

L. Wang, P. P. Ho, G. Liu, G. Zhang, and R. R. Alfano, “Ballistic 2-D imaging through scattering wall using an ultrafast Kerr gate,” Science 253, 769-771 (1991).

[CrossRef]
[PubMed]

Alberic Jaulin, Laurent Bigue, and Pierre Ambs, “High-speed degree-of-polarization imaging with a ferroelectric liquid-crystal modulator,” Opt. Eng. 47, 033201 (2008).

[CrossRef]

Alberic Jaulin, Laurent Bigue, and Pierre Ambs, “High-speed degree-of-polarization imaging with a ferroelectric liquid-crystal modulator,” Opt. Eng. 47, 033201 (2008).

[CrossRef]

M. J. Raković, G. W. Kattawar, M. Mehrubeoglu, B. D. Cameron, L. V. Wang, S. Rastegar, and G. L. Cote, “Light backscattering polarization patterns from turbid media: theory and experiment,” Appl. Opt. 38, 3399-3408 (1999).

[CrossRef]

B. D. Cameron, M. J. Raković, M. Mehrubeoglu, G. W. Kattawar, S. Rastegar, L. V. Wang, and G. L. Cote, “Measurement and calculation of the two-dimensional backscattering Mueller matrix of a turbid medium,” Opt. Lett. 23, 485-487 (1998).

[CrossRef]

H. H. Tynes, G. W. Kattawar, E. P. Zege, I. L. Katsev, A. S. Prikhach, and L. I. Chaikovskaya, “Monte Carlo and multicomponent approximation methods for vector radiative transfer by use of effective Mueller matrix calculations,” Appl. Opt. 40, 400-412 (2001).

[CrossRef]

E. P. Zege and L. I. Chaikovskaya, “New approach to the polarized radiative transfer problem,” J. Quant. Spectrosc. Radiat. Transfer 55, 19-31 (1996).

[CrossRef]

S. Chandrasekhar, *Radiative Transfer* (Dover, 1960).

M. J. Raković, G. W. Kattawar, M. Mehrubeoglu, B. D. Cameron, L. V. Wang, S. Rastegar, and G. L. Cote, “Light backscattering polarization patterns from turbid media: theory and experiment,” Appl. Opt. 38, 3399-3408 (1999).

[CrossRef]

B. D. Cameron, M. J. Raković, M. Mehrubeoglu, G. W. Kattawar, S. Rastegar, L. V. Wang, and G. L. Cote, “Measurement and calculation of the two-dimensional backscattering Mueller matrix of a turbid medium,” Opt. Lett. 23, 485-487 (1998).

[CrossRef]

C. Cox and W. Munk, “Statistics of sea surface derived from sun glitter,” J. Mar. Res. 13, 198-227 (1954).

K. F. Evans, “The spherical harmonic discrete ordinate method for three-dimensional atmospheric radiative transfer,” J. Atmos. Sci. 55, 429-446 (1998).

[CrossRef]

R. D. M. Garcia and C. E. Siewert, “A generalized spherical harmonics solution for radiative transfer models that include polarization effects,” J. Quant. Spectrosc. Radiat. Transfer 36, 401-423 (1986).

[CrossRef]

S. K. Gayen and R. R. Alfano, “Emerging optical biomedical imaging techniques,” Opt. Photonics News 7, 17-22 (1996).

[CrossRef]

L. C. Henyey and J. L. Greenstein, “Diffuse radiation in the galaxy,” Astrophys. J. 93, 70-83 (1941).

[CrossRef]

L. C. Henyey and J. L. Greenstein, “Diffuse radiation in the galaxy,” Astrophys. J. 93, 70-83 (1941).

[CrossRef]

L. Wang, P. P. Ho, G. Liu, G. Zhang, and R. R. Alfano, “Ballistic 2-D imaging through scattering wall using an ultrafast Kerr gate,” Science 253, 769-771 (1991).

[CrossRef]
[PubMed]

D. M. Winker, W. H. Hunt, and C. A. Hostetler, “Proceedings of laser radar techniques for atmospheric sensing,” Proc. SPIE 5575, 8-15 (2004).

[CrossRef]

D. M. Winker, W. H. Hunt, and C. A. Hostetler, “Proceedings of laser radar techniques for atmospheric sensing,” Proc. SPIE 5575, 8-15 (2004).

[CrossRef]

Alberic Jaulin, Laurent Bigue, and Pierre Ambs, “High-speed degree-of-polarization imaging with a ferroelectric liquid-crystal modulator,” Opt. Eng. 47, 033201 (2008).

[CrossRef]

H. H. Tynes, G. W. Kattawar, E. P. Zege, I. L. Katsev, A. S. Prikhach, and L. I. Chaikovskaya, “Monte Carlo and multicomponent approximation methods for vector radiative transfer by use of effective Mueller matrix calculations,” Appl. Opt. 40, 400-412 (2001).

[CrossRef]

E. P. Zege, I. L. Katsev, and I. N. Polonsky, “Multicomponent approach to light propagation in clouds and mists,” Appl. Opt. 32, 2803-2812 (1993).

[CrossRef]
[PubMed]

P. Zhai, G. W. Kattawar, and P. Yang, “Impulse response solution to the three-dimensional vector radiative transfer equation in atmosphere-ocean systems. I. Monte Carlo method,” Appl. Opt. 47, 1037-1047 (2008).

[CrossRef]
[PubMed]

G. W. Kattawar and D. J. Gray, “Mueller matrix imaging of targets in turbid media: effect of the volume scattering function,” Appl. Opt. 42, 7225-7230 (2003).

[CrossRef]

H. H. Tynes, G. W. Kattawar, E. P. Zege, I. L. Katsev, A. S. Prikhach, and L. I. Chaikovskaya, “Monte Carlo and multicomponent approximation methods for vector radiative transfer by use of effective Mueller matrix calculations,” Appl. Opt. 40, 400-412 (2001).

[CrossRef]

M. J. Raković, G. W. Kattawar, M. Mehrubeoglu, B. D. Cameron, L. V. Wang, S. Rastegar, and G. L. Cote, “Light backscattering polarization patterns from turbid media: theory and experiment,” Appl. Opt. 38, 3399-3408 (1999).

[CrossRef]

G. W. Kattawar and M. J. Raković, “Virtues of Mueller matrix imaging for underwater target detection,” Appl. Opt. 38, 6431-6438 (1999).

[CrossRef]

M. J. Raković and G. W. Kattawar, “Theoretical analysis of polarization patterns from incoherent backscattering of light,” Appl. Opt. 37, 3333-3338 (1998).

[CrossRef]

B. D. Cameron, M. J. Raković, M. Mehrubeoglu, G. W. Kattawar, S. Rastegar, L. V. Wang, and G. L. Cote, “Measurement and calculation of the two-dimensional backscattering Mueller matrix of a turbid medium,” Opt. Lett. 23, 485-487 (1998).

[CrossRef]

L. Roberti and C. Kummerow, “Monte Carlo calculations of polarized microwave radiation emerging from cloud structures,” J. Geophys. Res. 104, 2093-2104 (1999).

[CrossRef]

L. Wang, P. P. Ho, G. Liu, G. Zhang, and R. R. Alfano, “Ballistic 2-D imaging through scattering wall using an ultrafast Kerr gate,” Science 253, 769-771 (1991).

[CrossRef]
[PubMed]

M. J. Raković, G. W. Kattawar, M. Mehrubeoglu, B. D. Cameron, L. V. Wang, S. Rastegar, and G. L. Cote, “Light backscattering polarization patterns from turbid media: theory and experiment,” Appl. Opt. 38, 3399-3408 (1999).

[CrossRef]

B. D. Cameron, M. J. Raković, M. Mehrubeoglu, G. W. Kattawar, S. Rastegar, L. V. Wang, and G. L. Cote, “Measurement and calculation of the two-dimensional backscattering Mueller matrix of a turbid medium,” Opt. Lett. 23, 485-487 (1998).

[CrossRef]

C. Cox and W. Munk, “Statistics of sea surface derived from sun glitter,” J. Mar. Res. 13, 198-227 (1954).

D. M. O'Brien, “Accelerated quasi Monte Carlo integration of the radiative transfer equation,” J. Quant. Spectrosc. Radiat. Transfer 48, 41-59 (1992).

[CrossRef]

T. J. Petzold, *Volume Scattering Functions for Selected Ocean Waters* (Scripps Institution of Oceanography, 1977).

M. J. Raković, G. W. Kattawar, M. Mehrubeoglu, B. D. Cameron, L. V. Wang, S. Rastegar, and G. L. Cote, “Light backscattering polarization patterns from turbid media: theory and experiment,” Appl. Opt. 38, 3399-3408 (1999).

[CrossRef]

G. W. Kattawar and M. J. Raković, “Virtues of Mueller matrix imaging for underwater target detection,” Appl. Opt. 38, 6431-6438 (1999).

[CrossRef]

M. J. Raković and G. W. Kattawar, “Theoretical analysis of polarization patterns from incoherent backscattering of light,” Appl. Opt. 37, 3333-3338 (1998).

[CrossRef]

B. D. Cameron, M. J. Raković, M. Mehrubeoglu, G. W. Kattawar, S. Rastegar, L. V. Wang, and G. L. Cote, “Measurement and calculation of the two-dimensional backscattering Mueller matrix of a turbid medium,” Opt. Lett. 23, 485-487 (1998).

[CrossRef]

M. J. Raković, G. W. Kattawar, M. Mehrubeoglu, B. D. Cameron, L. V. Wang, S. Rastegar, and G. L. Cote, “Light backscattering polarization patterns from turbid media: theory and experiment,” Appl. Opt. 38, 3399-3408 (1999).

[CrossRef]

B. D. Cameron, M. J. Raković, M. Mehrubeoglu, G. W. Kattawar, S. Rastegar, L. V. Wang, and G. L. Cote, “Measurement and calculation of the two-dimensional backscattering Mueller matrix of a turbid medium,” Opt. Lett. 23, 485-487 (1998).

[CrossRef]

R. D. M. Garcia and C. E. Siewert, “A generalized spherical harmonics solution for radiative transfer models that include polarization effects,” J. Quant. Spectrosc. Radiat. Transfer 36, 401-423 (1986).

[CrossRef]

*Concise Dictionary of Scientific Biography* (Scribner, 1981), p. 643. Willebrord Snel von Royen used only one l in his last name.

L. Wang, P. P. Ho, G. Liu, G. Zhang, and R. R. Alfano, “Ballistic 2-D imaging through scattering wall using an ultrafast Kerr gate,” Science 253, 769-771 (1991).

[CrossRef]
[PubMed]

M. J. Raković, G. W. Kattawar, M. Mehrubeoglu, B. D. Cameron, L. V. Wang, S. Rastegar, and G. L. Cote, “Light backscattering polarization patterns from turbid media: theory and experiment,” Appl. Opt. 38, 3399-3408 (1999).

[CrossRef]

B. D. Cameron, M. J. Raković, M. Mehrubeoglu, G. W. Kattawar, S. Rastegar, L. V. Wang, and G. L. Cote, “Measurement and calculation of the two-dimensional backscattering Mueller matrix of a turbid medium,” Opt. Lett. 23, 485-487 (1998).

[CrossRef]

F. Weng, “A multi-layer discrete-ordinate method for vector radiative transfer in a vertically-inhomogeneous, emitting and scattering atmosphere II. Application,” J. Quant. Spectrosc. Radiat. Transfer 47, 35-42 (1992).

[CrossRef]

F. Weng, “A multi-layer discrete-ordinate method for vector radiative transfer in a vertically-inhomogeneous, emitting and scattering atmosphere-I. theory,” J. Quant. Spectrosc. Radiat. Transfer 47, 19-33 (1992).

[CrossRef]

D. M. Winker, W. H. Hunt, and C. A. Hostetler, “Proceedings of laser radar techniques for atmospheric sensing,” Proc. SPIE 5575, 8-15 (2004).

[CrossRef]

G. Yao, “Differential optical polarization imaging in turbid media with different embedded objects,” Opt. Commun. 241, 255-261 (2004).

[CrossRef]

H. H. Tynes, G. W. Kattawar, E. P. Zege, I. L. Katsev, A. S. Prikhach, and L. I. Chaikovskaya, “Monte Carlo and multicomponent approximation methods for vector radiative transfer by use of effective Mueller matrix calculations,” Appl. Opt. 40, 400-412 (2001).

[CrossRef]

E. P. Zege and L. I. Chaikovskaya, “New approach to the polarized radiative transfer problem,” J. Quant. Spectrosc. Radiat. Transfer 55, 19-31 (1996).

[CrossRef]

E. P. Zege, I. L. Katsev, and I. N. Polonsky, “Multicomponent approach to light propagation in clouds and mists,” Appl. Opt. 32, 2803-2812 (1993).

[CrossRef]
[PubMed]

L. Wang, P. P. Ho, G. Liu, G. Zhang, and R. R. Alfano, “Ballistic 2-D imaging through scattering wall using an ultrafast Kerr gate,” Science 253, 769-771 (1991).

[CrossRef]
[PubMed]

K. J. Voss and E. S. Fry, “Measurement of the Mueller matrix for ocean water,” Appl. Opt. 23, 4427-4439 (1984).

[CrossRef]
[PubMed]

S. R. Pal and A. I. Carswell, “Polarization anisotropy in lidar multiple scattering from atmospheric clouds,” Appl. Opt. 24, 3464-3471 (1985).

[CrossRef]
[PubMed]

K. Stamnes, S.-C. Tsay, W. Wiscombe, and K. Jayaweera, “Numerically stable algorithm for discrete-ordinate method radiative transfer in multiple scattering and emitting layered media,” Appl. Opt. 27, 2502-2509 (1988).

[CrossRef]
[PubMed]

E. P. Zege, I. L. Katsev, and I. N. Polonsky, “Multicomponent approach to light propagation in clouds and mists,” Appl. Opt. 32, 2803-2812 (1993).

[CrossRef]
[PubMed]

L. Roberti, “Monte Carlo radiative transfer in the microwave and in the visible: biasing techniques,” Appl. Opt. 36, 7929-7938 (1997).

[CrossRef]

S. G. Demos and R. R. Alfano, “Optical polarization imaging,” Appl. Opt. 36, 150-155 (1997).

[CrossRef]
[PubMed]

M. J. Raković and G. W. Kattawar, “Theoretical analysis of polarization patterns from incoherent backscattering of light,” Appl. Opt. 37, 3333-3338 (1998).

[CrossRef]

G. W. Kattawar and M. J. Raković, “Virtues of Mueller matrix imaging for underwater target detection,” Appl. Opt. 38, 6431-6438 (1999).

[CrossRef]

M. J. Raković, G. W. Kattawar, M. Mehrubeoglu, B. D. Cameron, L. V. Wang, S. Rastegar, and G. L. Cote, “Light backscattering polarization patterns from turbid media: theory and experiment,” Appl. Opt. 38, 3399-3408 (1999).

[CrossRef]

H. H. Tynes, G. W. Kattawar, E. P. Zege, I. L. Katsev, A. S. Prikhach, and L. I. Chaikovskaya, “Monte Carlo and multicomponent approximation methods for vector radiative transfer by use of effective Mueller matrix calculations,” Appl. Opt. 40, 400-412 (2001).

[CrossRef]

C. D. Mobley, L. K. Sundman, and E. Boss, “Phase function effects on oceanic light fields,” Appl. Opt. 41, 1035-1050(2002).

[CrossRef]
[PubMed]

G. W. Kattawar and D. J. Gray, “Mueller matrix imaging of targets in turbid media: effect of the volume scattering function,” Appl. Opt. 42, 7225-7230 (2003).

[CrossRef]

J. Zallat, C. Collet, and Y. Takakura, “Clustering of polarization-encoded images,” Appl. Opt. 43, 283-292 (2004).

[CrossRef]
[PubMed]

B. Laude-Boulesteix, A. De Martino, B. Drévillon, and L. Schwartz, “Mueller polarimetric imaging system with liquid crystals,” Appl. Opt. 43, 2824-2832 (2004).

[CrossRef]
[PubMed]

P. Zhai, G. W. Kattawar, and P. Yang, “Impulse response solution to the three-dimensional vector radiative transfer equation in atmosphere-ocean systems. I. Monte Carlo method,” Appl. Opt. 47, 1037-1047 (2008).

[CrossRef]
[PubMed]

L. C. Henyey and J. L. Greenstein, “Diffuse radiation in the galaxy,” Astrophys. J. 93, 70-83 (1941).

[CrossRef]

K. F. Evans, “The spherical harmonic discrete ordinate method for three-dimensional atmospheric radiative transfer,” J. Atmos. Sci. 55, 429-446 (1998).

[CrossRef]

L. Roberti and C. Kummerow, “Monte Carlo calculations of polarized microwave radiation emerging from cloud structures,” J. Geophys. Res. 104, 2093-2104 (1999).

[CrossRef]

C. Cox and W. Munk, “Statistics of sea surface derived from sun glitter,” J. Mar. Res. 13, 198-227 (1954).

R. D. M. Garcia and C. E. Siewert, “A generalized spherical harmonics solution for radiative transfer models that include polarization effects,” J. Quant. Spectrosc. Radiat. Transfer 36, 401-423 (1986).

[CrossRef]

F. Weng, “A multi-layer discrete-ordinate method for vector radiative transfer in a vertically-inhomogeneous, emitting and scattering atmosphere-I. theory,” J. Quant. Spectrosc. Radiat. Transfer 47, 19-33 (1992).

[CrossRef]

F. Weng, “A multi-layer discrete-ordinate method for vector radiative transfer in a vertically-inhomogeneous, emitting and scattering atmosphere II. Application,” J. Quant. Spectrosc. Radiat. Transfer 47, 35-42 (1992).

[CrossRef]

D. M. O'Brien, “Accelerated quasi Monte Carlo integration of the radiative transfer equation,” J. Quant. Spectrosc. Radiat. Transfer 48, 41-59 (1992).

[CrossRef]

E. P. Zege and L. I. Chaikovskaya, “New approach to the polarized radiative transfer problem,” J. Quant. Spectrosc. Radiat. Transfer 55, 19-31 (1996).

[CrossRef]

G. Yao, “Differential optical polarization imaging in turbid media with different embedded objects,” Opt. Commun. 241, 255-261 (2004).

[CrossRef]

Alberic Jaulin, Laurent Bigue, and Pierre Ambs, “High-speed degree-of-polarization imaging with a ferroelectric liquid-crystal modulator,” Opt. Eng. 47, 033201 (2008).

[CrossRef]

J. H. Ali, W. B. Wang, P. P. Ho, and R. R. Alfano, “Detection of corrosion beneath a paint layer by use of spectral polarization optical imaging,” Opt. Lett. 25, 1303-1305 (2000).

[CrossRef]

B. D. Cameron, M. J. Raković, M. Mehrubeoglu, G. W. Kattawar, S. Rastegar, L. V. Wang, and G. L. Cote, “Measurement and calculation of the two-dimensional backscattering Mueller matrix of a turbid medium,” Opt. Lett. 23, 485-487 (1998).

[CrossRef]

S. K. Gayen and R. R. Alfano, “Emerging optical biomedical imaging techniques,” Opt. Photonics News 7, 17-22 (1996).

[CrossRef]

D. M. Winker, W. H. Hunt, and C. A. Hostetler, “Proceedings of laser radar techniques for atmospheric sensing,” Proc. SPIE 5575, 8-15 (2004).

[CrossRef]

L. Wang, P. P. Ho, G. Liu, G. Zhang, and R. R. Alfano, “Ballistic 2-D imaging through scattering wall using an ultrafast Kerr gate,” Science 253, 769-771 (1991).

[CrossRef]
[PubMed]

T.Gehrels, ed. *Planets, Stars and Nebulae* (University of Arizona, 1974).

*Concise Dictionary of Scientific Biography* (Scribner, 1981), p. 643. Willebrord Snel von Royen used only one l in his last name.

S. Chandrasekhar, *Radiative Transfer* (Dover, 1960).

T. J. Petzold, *Volume Scattering Functions for Selected Ocean Waters* (Scripps Institution of Oceanography, 1977).