Khachatryan, R. G. “MICROORGANISMS’ ROLE IN THE FORMATION OF SLIPPAGE SURFACE”. Proceedings of the YSU C: Geological and Geographical Sciences 46, no. 2 (228) (July 27, 2012): 30–36. Accessed July 22, 2024. https://journals.ysu.am/index.php/proceedings-geol-geogr/article/view/vol46_no2_2012_pp030-036.