by Littleford, Philip O., Parsonnet, Victor, Spector, S.David
Published in The American journal of cardiology (01.05.1979)

by Scott, Meredith L., Stowe, Cary L., Nunnally, L.C., Spector, S.David, Moseley, Patterson W., Schumacher, Paul D., Thompson, Paul A.
Published in The Annals of thoracic surgery (01.08.1989)