R. D. . Susetyo, Wahyu Wilopo, Suwarno Hadisusanto, and Endah Retnaningrum, “Exploration of Indigeneous Biosurfactant-producing Bacillus sp. from Petroleum Hydrocarbon-contaminated Soil in Indonesia ”, App. Envi. Res., vol. 47, no. 4, pp. 1–13, Oct. 2025.