BibTex format
@article{SMITH:1977:10.1016/0030-4018(77)90086-4,
author = {SMITH, RW},
doi = {10.1016/0030-4018(77)90086-4},
journal = {OPTICS COMMUNICATIONS},
pages = {102--105},
title = {ASTIGMATISM FREE HOLOGRAPHIC LENS ELEMENTS},
url = {http://dx.doi.org/10.1016/0030-4018(77)90086-4},
volume = {21},
year = {1977}
}