Stjepić Srkalović, Željka, and Semir Ahmetbegović. “Nickel in Tuzla Topsoils: Its Distribution and Impacts”. Journal for Geography 16, no. 1 (June 30, 2021): 45–56. Accessed November 8, 2025. https://old.journals.um.si/index.php/geography/article/view/3222.