PASTARUS, J.-R. LONG-TERM STABILITY MONITORING OF THE MINING BLOCKS IN ESTONIAN OIL SHALE MINES. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 206–211, 2006. DOI: 10.17770/etr2003vol1.2008. Disponível em: https://journals.ru.lv/index.php/ETR/article/view/2008.. Acesso em: 4 may. 2024.