DEPARTMENT OF MATHEMATICS AND MECHANICS, EDITORIAL BOARD “PROCEEDINGS OF THE YSU”, YSU administration,. VLADIMIR S. SARGSYAN. Proceedings of the YSU A: Physical and Mathematical Sciences, Yerevan, Armenia, v. 47, n. 1 (230), p. 65–66, 2013. DOI: 10.46991/PYSU:A/2013.47.1.065. Disponível em: https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol47_no1_2013_pp065-066. Acesso em: 22 jul. 2024.