Nikolov, Valentin, and Mariyana Nikolova. “GEOMORPHOLOGICAL STUDIES OF JOVAN CVIJIĆ IN BULGARIA”. Journal of the Geographical Institute “Jovan Cvijić” SASA 66, no. 1 (April 30, 2016): 169–176. Accessed April 24, 2024. https://ojs.gi.sanu.ac.rs/index.php/zbornik/article/view/251.