Holming Konstantin. “The Effect of Digitalis or a Beta-Blocker, Alone or in Combination, on Atrial Fibrillation at Rest and During Exercise”. Upsala Journal of Medical Sciences 106, no. 1 (July 12, 2009): 77–80. Accessed May 13, 2024. https://ujms.net/index.php/ujms/article/view/6545.