Vasista, S. and Bhattad, G. 2017. Clinical and phonocardiographic evaluation of left ventricular function in patients with chronic obstructive pulmonary disease. International Journal of Research in Medical Sciences. 5, 10 (Sep. 2017), 4312–4318. DOI:https://doi.org/10.18203/2320-6012.ijrms20174481.