000 00289nam a2200121Ia 4500
008 211209s1971 xx 000 0 und d
041 _aeng
082 _a515.62 N71 MAR
100 _aMARRY R S
245 _aFINITE DIFFERENCES AND DIFFERENCIAL EQUATIONS
260 _c1971
300 _a259
999 _c13757
_d13757