1. Beall, A. C., Jr., Bloodwell, R. D., Arbegast, N. R., Liotta, D., Cooley, D. A., and De Bakey, M. (1969). Mitral cvtaoaslepvsre.evrIenenpPtlraotcshetrhmoeetmnibtcoHweiemtabhrotldiaVsacmlrv:oen,c-lpci.onvi3ce1ar9l,edeexdp.deiLrs.ikeAnp.creoBsritenhwe2esr0i.2s
2. Disc variance of Beall mitral valve;Robinson, M.J.; Hildner, F.J.; Greenberg, J.J.;Ann. ihorac. Surg,1971