00313nam a2200121Ia 4500082002000000100002200020245003800042260004000080300001400120490004700134500000500181700000500186  a515.35bP818.OD  aPontryagin, L. S.  aOrdinary differential equationsb  aMassachusettsbAddison-Wesleyc1962  avi, 298p.  aAdiwes international series in Mathematics  a  a