00331nam a2200109Ia 4500008004100000082001700041100002200058245004600080260003700126300002000163490003800183260312b        |||||||| |||| 00| 0 eng d  a514bR848.IH  aRotman, Joseph J.  aAn introduction to homological algebrab/  aNew York:bAcademic Press,c1979  axi, 376p. Index  aPure and Applied Mathematicsv 85