Krutaj, Farudin, and Elda Frasheri. 1998. “Quelques Particularites De La Morphologie Karstique En Albanie: The Peculiarities of The Karst Morphology in Albania”. Geografia Fisica E Dinamica Quaternaria 3 (4): 75-81. https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/1198.