1. Amir D., Mach J. and Saatkamp K. (1982). Existence of Chebyshev centers, best n-nets and best compact approximants.Transactions of the American Mathematical Society 271, 513–524.
2. Baronti M., Casini E. and Papini P.L. (1993). Equilateral sets and their central points.Rendiconti di Matematica e delle Sue Applicazioni 13, 133–148.
3. Benítez C., Fernández M. and Soriano M.L. (2002). Location of the Fermat-Torricelli medians of three points.Transactions of the American Mathematical Society 354, 5027–5038.
4. Garkavi A.L. (1964). The best possible net and the best possible crosss-section of a set in a normed space.Transactions of the American Mathematical Society 39, 111–132.
5. Veslý L. (1993). A characterization of reflexivity in the terms of the existence of generalized centers.Extracta Mathematicae 8, 125–131.