Hossain, A. I., N. Hosain, S. M. Islam, A. Shahidullah, Z. Rahman, M. Rahhman, and M. A. Kashem. “Sildenafil in Perioperative Management of Congenital Shunt Anomaly Patients With Pulmonary Hypertension”. Cardiovascular Journal, vol. 12, no. 1, Oct. 2019, pp. 9-12, doi:10.3329/cardio.v12i1.43412.