BibTex format
@article{Han:2013:10.1364/AO.52.008670,
author = {Han, D and Lee, K and Lim, J and Hong, SS and Kim, YK and Ahn, J},
doi = {10.1364/AO.52.008670},
journal = {APPLIED OPTICS},
pages = {8670--8675},
title = {Terahertz lens made out of natural stone},
url = {http://dx.doi.org/10.1364/AO.52.008670},
volume = {52},
year = {2013}
}