Agarwal, A. K., D. Sharma, S. G. Baidya, and D. Prajapati. “Variability Among 2D and 3D Methods of Calculating Mitral Valve Area: A Comparative Study With Pressure Half Time Method”. Nepalese Heart Journal, vol. 14, no. 2, Nov. 2017, pp. 13-17, doi:10.3126/njh.v14i2.18497.