00309nam a2200121Ia 4500082001700000100002100017245003000038260004800068300002100116490004000137500000500177700000500182  a512bN873.FF  aNorthcott, D. G.  aFinite free resolutionsb  aCambridgebCambridge University Pressc1976  axii, 271p. Index  aCambridge tracts in Mathematics, 71  a  a