“A Case Report of Wellens’ Syndrome: An Ominous Sign of Left Anterior Descending Artery Critical Stenosis and Impending Anterior Myocardial Infarction”, INDONES J MED, vol. 5, no. 3, pp. 246–252, Aug. 2020, doi: 10.26911/theijmed.2020.5.3.292.