00298nam a2200121Ia 4500082002000000100001800020245004100038260003400079300001400113490003900127500000500166700000500171  a515.35bR325.AN  aReed, Michael  aAbstract non linear wave equationsb  aBerlinbSpringer-Verlagc1976  avi, 128p.  aLecture notes in Mathematicsv 507  a  a