00328nam a2200121Ia 4500082001700000100001600017245003100033260004800064300002800112490005600140500000500196700000500201  a512bC678.SF  aCohn, P. M.  aSkew field constructionsb  aCambridgebCambridge University Pressc1977  axii, 253p. Index. Bibl.  aLondon Mathematical Society lecture note series, 27  a  a