Ferdaushi, U. H., M. A. Ali, S. Nabi, M. Islam, M. S. Alam, and M. A. Rahman. “Evaluation of Morphology of Premature Ventricular Contraction on 12-Lead Electrocardiogram”. Bangladesh Heart Journal, vol. 31, no. 2, Apr. 2017, pp. 74-79, doi:10.3329/bhj.v31i2.32378.