Author: Narang, T. D.
- : Approximation relative to an ultra function. (English). Archivum Mathematicum, vol. 22 (1986), issue 4, pp. 181-186
- : Characterizations of elements of best approximation in non-Archimedean normed spaces. (English). Archivum Mathematicum, vol. 21 (1985), issue 2, pp. 123-126
- : On $f$-best approximation in topological spaces. (English). Archivum Mathematicum, vol. 21 (1985), issue 4, pp. 229-233
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