Velikov, P., N. Kapincheva, I. Trifonova, V. Velev, M. Popov, I. Ivanov, R. Chipeva, et al. “SARS-CoV-2 Infection in Children and Young People in Bulgaria – a Prospective, Single-Center, Cohort Study”. Acta Medica Bulgarica 50, no. 2 (June 30, 2023): 10–19. Accessed November 21, 2024. https://journals.mu-sofia.bg/index.php/amb/article/view/2.