000 00279nam a2200121Ia 4500
008 211209s1953 xx 000 0 und d
041 _aeng
082 _a530.15 N53 COU/HIL
100 _aCOURANL R
245 _aMETHODS OF MATHEMATICAL PHYSICS
260 _c1953
300 _a561
999 _c15363
_d15363