@article{journal,
author = {Figueras, J. and Badell, J. and Mart{\'i}nez, M. and Ruiz, A. and Serrano, S.},
title = {Estudio refractom{\'e}trico y conosc{\'o}pico de las gemas facetadas transparentes birrefringentes de la colecci{\'o}n del Museo de Geologia de Barcelona},
year = {2004},
volume = {12},
pages = {187--195},
journal = {Treballs del Museu de Geologia de Barcelona},
keywords = {Faceted gems, Figures of interference, Conoscope, Birrefringence, Refractometry, Catalogue, Museu de Geologia, Barcelona, Spain.}
}