MARCHEV, Dragomir; BORISOV, Borislav; PAVLOVA, Nataliya; IBRYAMOV, Sunay; ATANASOVA, Teodora; YORDANOVA, Galina; GEORGIEV, Alex; PETROV, Samuil. TEN YEARS OF ASTRONOMICAL OBSERVATORY AT SHUMEN UNIVERSITY. KNOWLEDGE - International Journal , [S. l.], v. 72, n. 3, p. 313–318, 2025. Disponível em: https://ojs.ikm.mk/index.php/kij/article/view/7851. Acesso em: 5 jun. 2026.