Ab initio calculations of optical constants of GaSe and InSe layered crystals / S. Y. Sarkisov, A. V. Kosobutsky, V. N. Brudnyi, Y. N. Zhuravlev // Physics of the solid state. 2015. Vol. 57, № 9. P. 1735-1740. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000551980