Petrosyan, A. A. “VARIATIONAL PROBLEM FOR SOME CLASS OF NONLINEAR PSEUDOPARABOLIC OPERATORS”. Proceedings of the YSU A: Physical and Mathematical Sciences 42, no. 1 (215) (September 6, 2023): 24–33. Accessed November 23, 2024. https://pub.ysu.am/index.php/proceedings-phys-math/article/view/vol42_no1_2008_p024-033.