00314nam a2200121Ia 4500082001600000100002500016245003500041260003400076300001300110490005900123500000500182700000500187  a516bK65.LC  aKlingenberg, Wilhelm  aLectures on closed geodesicsb  aBerlinbSpringer-Verlagc1978  aix, 227p  aDie Grundlehren der Mathematischen Wissenschaften, 230  a  a