Kalatsei, Liudmila, D. M. N. P. K. Dassanayake, and Naveen D. K. N. Direcksze. “Clinical and Echocardiographic Features of Patients With Single-Chamber and Dual-Chamber Pacemakers”. International Journal of Research in Medical Sciences 14, no. 4 (March 30, 2026): 1324–1328. Accessed June 10, 2026. https://www.msjonline.org/index.php/ijrms/article/view/16503.