00314nam a2200121Ia 4500082001900000100002500019245002800044260004900072300002100121490004000142500000500182700000500187  a512.7bL282.BC  aLanglands, Robert P.  aBase change for GL(2)b  aNew JerseybPrinceton University Pressc1980  avii, 236p. Index  aAnnals of Mathematics studies v 96  a  a