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Author(s): Cheng, S.Y. View this author's profile
Source: Mathematische Zeitschrift, v. 143, (3), 1975, p. 289-297
Article, 1975

Author(s): Li, Wei Ping View this author's profile ; Qin, Zhenbo
Source: Mathematische Zeitschrift, v. 222, (2), 1996, Jun, p. 279-303
Article, 1996