1. New methods of determining mechanical properties of rocks;Protodyakonov,1960
2. Determining rock strength with specimens of irregular shape;Protodyakonov;Ugol,1957
3. A study of the physico-mechanical properties of the rocks of some Georgian ore deposits;Melekidze,1959
4. Some results of an investigation into the mechanical strength of rocks and ores of Krivoy Rog with irregular-shaped specimens;Tokhtuyev,1958
5. Determining the strength of rock strata on irregularly-shaped specimens;Ilivitskii;Ugol,1961