Pastarus, Jyri-Rivaldo, and Sergei Sabanov. “CONCEPT OF RISK ASSESSMENT FOR ESTONIAN OIL SHALE MINES”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 18, 2005): 237–242. Accessed May 3, 2024. https://journals.rta.lv/index.php/ETR/article/view/2141.