Kharitonov Т. В. “Granulometry of Diamonds in the Perm Territory According to Prospecting Data in the 1940s - 1970s”. Problems of Mineralogy, Petrography and Metallogeny. Scientific Readings in Memory of P.N. Chirvinsky, no. 24, Oct. 2021, pp. 274-8, doi:10.17072/chirvinsky.2021.274.