Yankov, Y., D. Georgiev, P. Iliev, A. Tonev, S. Arangelov, K. Valchev, D. Panayotov, and S. Peeva. 2022. “Infestation With Protostrongylids of the Balkan Chamois (Rupicapra Rupicapra Balcanica, Bolkey 1925) in Rila National Park, Bulgaria: Preliminary Data”. Bulgarian Journal of Agricultural Science 28 (3): 521-25. https://agriacad.eu/ojs/index.php/bjas/article/view/1619.