1. Quadricuspid semilunar valve;Hurwitz;Am J Cardiol,1973
2. Congenital malformations of the aortic and pulmonary valves;Simonds;Am J Med Sci,1923
3. Supernumerary aortic cusps with multiple fenestrations and with displacement of the left coronary orifice;Wyatt;Arch Pathol,1948
4. Pericarditis due to a mycotic aneurysm in subacute bacterial endocarditis;McColl;Guys Hosp Rep,1958
5. Congenital quadricuspid aortic valve;McRonald;Am J Cardiol,1966