00301nam a2200121 a 450000500170000002000150001708200200003210000230005224500350007526000270011030000230013770000190016020251203091915.0  a3540547460  a512.55,bD, GEL  aGelfand, Sergei I.  aMethods of Homological Algebra  aBerlinbSpringerc1996  axviii,372p.c23cm.  aManin, Yuri I.