Pastarus, J.-R., Sabanov, S., Shestakova, J., & Nikitin, O. (2015). RISK ANALYSIS OF THE PILLAR STRENGTH IN THE ESTONIA MINE. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, 1, 19-23. https://doi.org/10.17770/etr2009vol1.1113