NIKOLOVA-ALEXIEVA, Valentina; VALEVA, Katina. INFLUENCE OF COVID-19 ON THE INNOVATION ACTIVITY OF THE BIO-SECTOR IN BULGARIA. KNOWLEDGE - International Journal , [S. l.], v. 49, n. 1, p. 89–95, 2021. Disponível em: https://ojs.ikm.mk/index.php/kij/article/view/4623. Acesso em: 27 jun. 2026.