000 00307nam a2200145Ia 4500
008 190201s9999 xx 000 0 und d
082 _a530
082 _b15 BUT
100 _a"Butkov, Eugene"
245 0 _aMathematical Physics
260 _aLondon
260 _bA.W.P
260 _c1968
300 _a735
999 _c35513
_d35513