00549nam a2200181Ia 4500082001700000100002000017245005100037260005200088300001500140490005300155500000500208690000600213700000500219952009900224964001700323921001000340999001700350  a514bN147.HI  aNagano, Tadashi  aHomotopy invariants in differential geometryb  aProvidencebAmerican Mathematical Societyc1970  a41p. Bibl.  aAmerican Mathematical Society memoirs v no. 100  a  a   a  00104070aISIbISId1998-09-16l0o514 N147.HIpDP18309r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a11412  c11412d11412