Initial results of the Project of the German Breast Cancer Study Group on “breast saving therapy of the small breast cancer”. - Rauschecker,H.F.; Gatzemeier,W.; Sauer,R.; Seegenschmiedt,M.H.; Schauer,A.; Ummenhofer,L.; Sauerbrei,W.; Schmoor,C.; Schumacher,M. (Chirurg, 1992)