19.     Martinez C, Bernard A, Dulgheru R, Incarnato P, Oury C, Lancellotti P. Pulmonary Hypertension in Aortic Stenosis and Mitral Regurgitation: Rest and Exercise Echocardiography Significance. Prog Cardiovasc Dis. Elsevier Inc; 2016 Jul 8;59(1):59–70.