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]

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]

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).

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]

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-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. 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).