00340nam a2200121Ia 4500082001900000100003800019245002300057260003600080300003100116490003900147500000500186700002700191  a515.9bF229.RS  aFerkas, Hershel M. and Kra, Irwin  aRiemann surfacesb  aNew YorkbSpringer-Verlagc1980  ax, 337p. Index. Bibl. Fig.  aGraduate texts in Mathematicsv 71  a  aKra, Irwin ; jt. auth.