Numerical study of multiline CO laser frequency conversion in a ZnGeP2 crystal to the THz range / Y. M. Andreev, A. A. Ionin, I. O. Kinyaevskiy, Y. M. Klimachev // Bulletin of the Russian Academy of Sciences: Physics. 2019. Vol. 83, № 3. P. 237-241. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000723331