Trapeznikov Д.Е. 2021. Petrotypes of sandstones of the Sheshminsky horizon in the Southwestern part of the Solikamsk depression. Problems of mineralogy, petrography and metallogeny. Scientific readings in memory of P.N. Chirvinsky. 24 (Oct. 2021), 253–260. DOI:https://doi.org/10.17072/chirvinsky.2021.253.