Angelova D. Endodynamic determination and rearrangement of valley systems in Bulgaria at the Pliocene-Quaternary boundary . Geog. Fis. Dinam. Quat. [Internet]. 2003 Jan. 1 [cited 2026 Jul. 27];6:19-24. Available from: https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/1250