00331nam a2200121Ia 4500082001800000100002100018245007700039260003400116300001000150490003900160500000500199700000500204  a512.7bZ72.CP  aZimmer, Horst G.  aComputational problems, methods and results in algebraic number theoryb  aBerlinbSpringer-Verlagc1972  a103p.  aLecture notes in Mathematicsv 262  a  a