STOYANOV, S.; FILIPOVA, M. RESEARCH OF THE VARIATIONS OF THE ATMOSPHERIC OZONE AND CHANGE OF THE ULTRAVIOLET SUN RADIATION OVER NORTHEASTERN BULGARIA. JOURNAL SCIENTIFIC AND APPLIED RESEARCH, [S. l.], v. 2, n. 1, p. 90–93, 2023. DOI: 10.46687/jsar.v2i1.48. Disponível em: https://jsar.ftn.shu.bg/ojs-3.3.0-7/index.php/jsar/article/view/48. Acesso em: 7 nov. 2024.