000			00380nam a2200133Ia 4500
008			180613s9999||||xx |||||||||||||| ||und||
041			_aen
082			_a515.35
100			_aSPIEGEL, Murray R.
245		0	_aTheory and problems of calculus of finite differences and difference equations
260			_aAmerica _bMcGraw - Hill boojk company _c1971
300			_a259p.
942			_cSR
999			_c83320 _d83320