Boynagryan, V.R. 2015. “DISPLAYS OF KARST AND FORMING OF UNDERGROUND EMPTINESSES IN ARMENIAN HIGHLAND”. Proceedings of the YSU C: Geological and Geographical Sciences 49 (3 (238). Yerevan, Armenia:31-37. https://doi.org/10.46991/PYSU:C/2015.49.3.031.