Breznik, Marko, and Ljubo Žlebnik. “Geologic Conditions Along the Drava River Between Maribor and Ptuj With Special Regard to the Construction of Water Power Plants”. Geologija 7, no. 1 (June 30, 1961): 151–176. Accessed April 28, 2024. https://www.geologija-revija.si/index.php/geologija/article/view/1577.