00279nam a2200121Ia 4500082001700000100001700017245002400034260003400058300001600092490003900108500000500147700000500152  a516bOr71.SM  aOrlik, Peter  aSeifert manifoldsb  aBerlinbSpringer-Verlagc1972  aviii, 155p.  aLecture notes in Mathematicsv 291  a  a