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245 1 0 _aVol. 69 No. 2
260 _c1988
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_gVol. 69 No. 2
_tAdvances in Mathematics. 1988
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856 4 0 _uhttps://www.sciencedirect.com/journal/advances-in-mathematics/vol/69/issue/2
942 _cIS
999 _c14720
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