00295nam a2200121Ia 4500082002000000100002000020245003600040260003400076300001400110490003900124500000500163700000500168  a515.35bT244.PD  aTaylor, Michael  aPseudo differential operatorsb  aBerlinbSpringer-Verlagc1974  avi, 155p.  aLecture notes in Mathematicsv 416  a  a