KRASNIKOVA, Olena, et al. “ANALYSIS OF THE METHODS OF DETERMINING THE BRITTLENESS INDEX AND THEIR APPLICATION FOR TERRIGENOUS RESERVOIR ROCKS OF THE DNIPRO-DONETSK BASIN”. Visnyk of Taras Shevchenko National University of Kyiv. Geology, vol. 1, no. 104, Jan. 2025, pp. 22-29, https://doi.org/10.17721/1728-2713.104.03.