000 00360nam a2200157Ia 4500
008 190201s9999 xx 000 0 und d
020 _a3540905936
082 _a510
082 _b76 GUY
100 _a"Guy, Richard. K"
245 0 _aUnsolved Problems in Num
260 _aNew York
260 _bSpringer-Verlag
260 _c1981
300 _a"xviii, 161"
999 _c26538
_d26538