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- [4] NEGATIVE RESULT ON CONTINUITY OF BEST APPROXIMATIONS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1974, 21 (05): : A488 - A488
- [6] Lipschitz continuity of best approximations and Chebyshev centers CHINESE SCIENCE BULLETIN, 1998, 43 (03): : 185 - 188
- [10] AVERAGED MODULI OF CONTINUITY AND SOME THEIR RELATIONS TO BEST APPROXIMATIONS DOKLADY AKADEMII NAUK SSSR, 1977, 236 (02): : 288 - 291