Klapchuk, Volodymyr, Igor Makaruk, Oleksandr Novosiolov, and Lesia Polyova. “Exploration of Ozokerite Deposits on the Territory of Austrian Galicia: Short Historical Survey”. Skhid, no. 6(170) (December 21, 2020): 13–20. Accessed December 6, 2021. http://skhid.kubg.edu.ua/article/view/218799.