00301nam a2200109Ia 4500008004100000040003800041100001500079245004100094250000800135260003300143300001500176211214s9999    xx            000 0 und d  cJayakar Knowledge Resource Centre  aCourant, R 0aMethods of mathematical physics: v 1  a1st  bInterscienceaNew Yorkc1953  axv,561p p.