K. Bondar, A. Sachko, M. Churubrov, and I. Mamyshev, “New data on gas composition of the air in gypsum caves from Podillya and Bukovyna”, Вісник: Геологія, vol. 2, no. 81, pp. 44–48, Mar. 2018, doi: 10.17721/1728-2713.81.07.