Shtukenberg, Alexander. Optically Anomalous Crystals [electronic resource] by Alexander Shtukenberg, Yurii O Punin and Bart Kahr - Dordrecht Springer 2007 http://dx.doi.org/10.1007/1-4020-5353-3 ISBN: 1402053533 Dewey Class. No.: 548.9 / (e-book)