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References:
[1] Ahuja G. C, Narang T. D., Swaran Trehan: Best Approximation on Convex Sets in a Metric Space. J. Approximation Theory, 12 (1974), 94-97. MR 0358177
[2] Ahuja G. C, Narang T. D., Swaran Trehan: Certain Results on Best Approximation and continuity of Metric Projections. Nanta Mathematika, 11 (1978), 103-107. MR 0510843
[3] Cheney E. W.: Introduction to Approximation Theory. McGraw Hill, 1966. MR 0222517 | Zbl 0161.25202
[4] Rolfsen, Dale: Geometric Methods in Topological Spaces. Topology Conference, Arizona State University, 1967.
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