The role of hydrocarbon-oxidizing bacteria Acinetobacter pitti. RKB1 and Bacillus sp. RKB2 in the processes of bio-solubilization of brown coal from the Kiyakty coal deposit (Karaganda, Kazakhstan). Eurasian Journal of Ecology, v. 60, n. 3, p. 15–23, 27 Sep.2019.