V.N. Kataev (2014). KARST SINKS OF THE PERM REGION (THE WESTERN URAL). SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 14th SGEM GeoConference on SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING. https://doi.org/10.5593/sgem2014/b12/s2.071