00307nam a2200121Ia 4500082001700000100002100017245004300038260003400081300002100115490003900136500000500175700000500180  a516bD988.CC  aDupont, Johan L.  aCurvature and characteristic classesb  aBerlinbSpringer-Verlagc1978  avii, 175p. Index  aLecture notes in Mathematicsv 640  a  a