Dawood, Adil. “Use of Retrograde Cardioplegia in Coronary Artery Bypass Graft Surgery”. Journal of the Faculty of Medicine Baghdad 58, no. 1 (April 3, 2016): 13-15. Accessed October 28, 2020. http://iqjmc.uobaghdad.edu.iq/index.php/19JFacMedBaghdad36/article/view/188.