Chinese Quarterly Journal of Mathematics ›› 1987, Vol. 2 ›› Issue (2): 108-109.
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YANG Li-qun. [J]. Chinese Quarterly Journal of Mathematics, 1987, 2(2): 108-109.
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URL: https://sxjk.magtechjournal.com/EN/
https://sxjk.magtechjournal.com/EN/Y1987/V2/I2/108
