Attou, Rachid, et al. “The Association of Dobutamine and Ivabradine in Heart Failure and Circulatory Choc: A Case Report and Narrative Review”. Cardiology and Cardiovascular Medicine, vol. 4, no. 6, Dec. 2020, pp. 753-9, http://www.fortunejournals.org/ojs/index.php/ccm/article/view/15987.