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041 0 _aeng
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245 1 0 _aVol. 74 No. 3
260 _c1952
773 1 8 _7nnas
_gVol. 74 No. 3
_tAmerican Journal of Mathematics. 1952
_w000012165
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856 4 0 _uhttps://www.jstor.org/stable/10.2307/i316365
942 _cIS
999 _c12167
_d12167