YSU Administration and Editorial Board of “Proceedings of the YSU” 2019. IN MEMORY OF MIHRAN S. SHARAMBEYAN. Proceedings of the YSU A: Physical and Mathematical Sciences. 53, 1 (248) (Apr. 2019), 65–66. DOI:https://doi.org/10.46991/PYSU:A/2019.53.1.65.