Sahi, Ravi, et al. “Prevalence and Patterns of Coronary Artery Disease in Patients Undergoing Cardiac Surgery for Rheumatic and Non- Rheumatic Valvular Heart Disease in a Tertiary Care Center of Nepal”. Nepalese Heart Journal, vol. 15, no. 2, Nov. 2018, pp. 21-24, doi:10.3126/njh.v15i2.21472.