R.PASTARUS, J.; TOMBERG, T. MINING BLOCK STABILITY ANALYSIS IN ESTONIAN OIL SHALE MINES BY STATISTICAL METHODS. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 132–138, 2001. DOI: 10.17770/etr2001vol1.1931. Disponível em: https://journals.rta.lv/index.php/ETR/article/view/1931.. Acesso em: 3 may. 2024.