Gnidets, V., K. Grygorchuk, L. Koshil, and M. Yakovenko. 2018. “Lithofacies Features and Accumulating Conditions of Middle Devonian Basal Layers of Dobrudja Foredeep”. Visnyk of Taras Shevchenko National University of Kyiv. Geology 2 (81): 6-11. https://doi.org/10.17721/1728-2713.81.01.