00278nam a2200109Ia 4500082001700000100002100017245005100038260004800089300002100137500000500158700000500163  a512bN873.LR  aNorthcott, D. G.  aLessons on rings, modules and multiplicitiesb  aCambridgebCambridge University Pressc1968  axiv, 444p. Index  a  a