SAVOVA, A.; BERBEROVA , R. Development of ornithological tourism in the Kresna Gorge – opportunity for conservation of the Griffon Vulture (Gyps fulvus). Annual of Natural Sciences Department, [S. l.], v. 7, p. 1–8, 2022. DOI: 10.33919/ansd.22.7.1. Disponível em: https://ojs.nbu.bg/index.php/ANSD/article/view/858. Acesso em: 22 may. 2024.