KRASNIKOVA O, KUZMENKО P, VYZHVA S. ANALYSIS OF THE METHODS OF DETERMINING THE BRITTLENESS INDEX AND THEIR APPLICATION FOR TERRIGENOUS RESERVOIR ROCKS OF THE DNIPRO-DONETSK BASIN. Вісник: Геологія. 2025;1(104):22-29. doi:10.17721/1728-2713.104.03