Khachanov, K. and Grigoryan, M. 2015. THE GREAT GEOLOGIST: (on the occasion of the 80th anniversary of Academician Sergey V. Grigoryan). Proceedings of the YSU C: Geological and Geographical Sciences. 49, 1 (236) (Apr. 2015), 61–63. DOI:https://doi.org/10.46991/PYSU:C/2015.49.1.061.