F. G. Agis, R. S. Cudney, and E. R. Méndez, "Analysis of the performance of a double-pass confocal microscope that uses a phase conjugating mirror,"
in Advances in Photorefractive Materials, Effects and Devices, P. Andersen, P. Johansen, H. Pedersen, P. Petersen, and M. Saffman, eds.,
Vol. 27 of Trends in Optics and Photonics
(Optical Society of America, 1999), paper WMPC3.