Danielian, E.A., and S.K. Arzumanyan. “STABILITY OF FREQUENCY DISTRIBUTION IN FRAME OF NATURAL PARAMETRIZATION. I”. Proceedings of the YSU A: Physical and Mathematical Sciences 45, no. 1 (224) (February 16, 2011): 18–22. Accessed November 22, 2024. https://pub.ysu.am/index.php/proceedings-phys-math/article/view/vol45_no1_2011_pp018-022.