000			00296nam a2200133Ia 4500
001			12705
008			170722s9999 xx 000 0 und d
100			_aKeith, Alexander
245			_aZero level arithmetic /
260			_c1963.
653			_aArithmetic
653			_aMathematics
942			_cGEN
999			_c64438 _d64438