Abstract
The assertion made by S. Kaushik in a recent paper [J. Opt. Soc. Am. A 14, 596 (1997)] that the -matrix propagation algorithm that he derived is new and represents an improvement over the earlier research is apparently incorrect. A review of the literature shows that every feature of the algorithm as presented in the above reference has been known for many years.
© 1998 Optical Society of America
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