CO laser frequency mixing in nonlinear crystals ZnGeP2 and GaSe / L. Zhang, J. Xie, A. A. Kotkov [et.al.] // Optics and Precision Engineering. 2012. Vol. 20, № 2. С. 277-286. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000431828