BibTex format
@article{Torok:1997:10.1364/AO.36.002305,
author = {Torok, P and Varga, P},
doi = {10.1364/AO.36.002305},
journal = {APPLIED OPTICS},
pages = {2305--2312},
title = {Electromagnetic diffraction of light focused through a stratified medium},
url = {http://dx.doi.org/10.1364/AO.36.002305},
volume = {36},
year = {1997}
}