Yoncheva, I., D. Biserov, and M. Negreva. “Permanent Pacemaker Implantation: Early Post-Implantation Data”. Acta Medica Bulgarica 51, no. 1 (March 18, 2024): 8–16. Accessed April 2, 2025. https://journals.mu-sofia.bg/index.php/amb/article/view/59.