A. Waśkowska, S. Hnylko, S. Bakayeva, J. Golonka, T. Słomka, and L. Heneralova, “Rocky forms in the Yamna Sandstone (Skyba Nappe, Outer Carpathians, Ukraine)”, geotour, no. 1–2 (56–57), p. 3, Jul. 2020.