00377nam a2200109Ia 4500008004100000082001700041100001800058245006400076260004500140300001000185440007200195260827b        |||||||| |||| 00| 0 eng d  a514bR646.HI  aRoberts, Paul  aHomological invariants of modules over commutative ringsb/  aMontreal:bUniversite de Montreal,c1980  a110p.  aUniversity of Montreal, seminaire de Mathematiques superieures ; 72