00312nam a2200121Ia 4500082001900000100001900019245005000038260003400088300001900122490003900141500000500180700000500185  a512.7bIs79.GF  aIshida, Makoto  aThe genus fields of algebraic number fieldsb  aBerlinbSpringer-Verlagc1976  av, 116p. Index  aLecture notes in Mathematicsv 555  a  a