M. Milošević, J. Ćalić, J. Kovačević-Majkić, and M. Milivojević, “THUFUR MORPHOLOGY WITHIN THE PONOR DEPRESSION (STARA PLANINA, SERBIA)”, J. Geogr. Inst. Cvijic, vol. 72, no. 2, pp. 117–132, Aug. 2022.