000 00280nam a2200121Ia 4500
008 200906s9999 xx 000 0 und d
082 _a517.383 D855
100 _aDUFF.G.F.D
245 0 _aPARTIAL DIFFERENTIAL EQUATIONS
260 _bO.U.P
_c1956
300 _a23X15
942 _cBK
999 _c61932
_d61932