STOYANOVA, A.; BERBEROVA, R. Mobile amateur applications for marking and tracking birds as a tool for protecting them and for development of ornithological tourism. Annual of Natural Sciences Department, [S. l.], v. 8, p. 1–7, 2023. DOI: 10.33919/ansd.23.8.1. Disponível em: https://ojs.nbu.bg/index.php/ANSD/article/view/1122. Acesso em: 6 jun. 2025.