Sheppard, C.J.R. (1995). "Approximate calculation of the reflection coefficient from a stratified medium". Pure and Applied Optics: Journal of the European Optical Society Part A. 4 (5): 665. Bibcode:1995PApOp...4..665S. doi:10.1088/0963-9659/4/5/018.
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Sheppard, C.J.R. (1995). "Approximate calculation of the reflection coefficient from a stratified medium". Pure and Applied Optics: Journal of the European Optical Society Part A. 4 (5): 665. Bibcode:1995PApOp...4..665S. doi:10.1088/0963-9659/4/5/018.