Pastarus, Juri-Rivaldo, Sergei Sabanov, Jekaterina Shestakova, and Oleg Nikitin. “RISK ANALYSIS OF THE PILLAR STRENGTH IN THE ESTONIA MINE”. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (August 3, 2015): 19–23. Accessed April 6, 2025. https://journals23.rta.lv/index.php/ETR/article/view/1113.