1. Kang WY, Kim W, Moon Y, John SH, Choi JB, Jo SC, Jung AD, Jo YC, Hwang SH, Kim W. Two cases of quadricuspid aortic valve associated with aortic regurgitation and infective endocarditis. J Cardiovasc Ultrasound. 2007. 15:131–135.
Article
2. D'Aloia A, Vizzardi E, Bugatti S, Chiari E, Repossini A, Muneretto C, Dei Cas L. A quadricuspid aortic valve associated with severe aortic regurgitation and left ventricular systolic dysfunction. Eur J Echocardiogr. 2009. 10:724–725.