Kadebskaya, O., and I. Tchaikovskiy. “Staging in the Hypergene Transformation of Sulphate and Carbonate Rocks (based on Slide-Rocks under Organ Tubes in Kungur Ice Cave)”. Acta Carsologica, vol. 44, no. 2, Dec. 2015, doi:10.3986/ac.v44i2.610.