- Risk analysis of the pillar strength in the Estonia minePastarus, Jüri-Rivaldo; Sabanov, Sergei; Šestakova, Jekaterina; Nikitin, OlegVide. Tehnologija.Resursi = Environment. Technology. Resources : Proceedings of the 7th International Scientific and Practical Conference : June 25-27, 2009. Volume 12009 / p. 19-23 : ill