000 00295nam a2200121Ia 4500
008 191031s9999 xx 000 0 und d
100 _aDorofeev G et.
245 0 _aElementary mathamatics selected topics and problem solving
260 _bMIR
260 _c1973
365 _b10
942 _cBK
999 _c200405
_d200405