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2. On the center of a convex set;Brodskii;Dokl. Akad. Nauk SSSR (N. S.),1948
3. Normal structure coefficients for Banach spaces;Bynum;Pacific J. Math.,1980
4. Some more Banach spaces with normal structure;van Dulst;J. Math. Anal. Appl.,1984
5. Fixed points of nonexpansive mappings and Chebyshev centers in Banach spaces with norms of type KK;van Dulst,1983