Analytical approximation of spectrum for pulse X-ray tubes / S. Vavilov, G. M. Koshkin, V. A. Udod, O. Fofanof // Journal of Physics: Conference Series. 2016. Vol. 671. P. 012061 (1-5). URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000625286