Petrosyan, A. H. “THE INVESTIGATION OF THE DIFFERENTIAL OPERATOR’S POINT SPECTRUM IN INFINITY WITH PRECISE BEHAVIOUR COEFFICIENTS”. Proceedings of the YSU A: Physical and Mathematical Sciences 37, no. 3 (202) (January 16, 2025): 8–15. Accessed January 22, 2026. https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol37_no3_2003_pp008-015.