M. Mahmood, S. Haque, M. Siddique, C. Ahmed, and Z. Hossain, “Doppler Evaluation of Left to Right Shunt (Qp/Qs) in Patients with Isolated Ventricular Septal Defect (Vsd)”, Mymensingh Med. J., vol. 16, no. 2, pp. 181–86, Oct. 2007.