00321nam a2200121Ia 4500082001700000100001700017245002700034260004800061300002000109490006000129500000500189700000500194  a514bC883.ZZ  aCrabb, M. C.  aZZ/2-homotopy theoryb  aCambridgebCambridge University Pressc1980  aiv, 128p. Index  aLondon Mathematical Society lecture note seriesv v. 44  a  a