00315nam a2200121Ia 4500082001700000100001900017245006000036260003400096300001400130490003900144500000500183700000500188  a514bB344.OT  aBaues, Hans J.  aObstruction theory on homotopy classification of mapsb  aBerlinbSpringer-Verlagc1977  axi, 387p.  aLecture notes in Mathematicsv 628  a  a