### Conditions of unicity of the best non-symmetric $$$L_1$$$-approximant

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Babenko V.F., Glushko V.N. "On unicity of the best approximant in metric of $$$L_1$$$ space", *Ukrainian Math. J.*, 1994; 46(5): pp. 475-483. (in Russian)

Gorbenko M.Ye. "On unicity of the best $$$L_1$$$-approximant with coefficient constraints", *Dnipr. Univ. Math. Bull.*, 2000; 5: pp. 47-55. (in Russian)

Korneichuk N.P. *Exact constants in approximation theory*, Moscow, 1987. (in Russian)

Pinkus A., Strauss H. "$$$L_1$$$-approximation with Constraints", *Trans. Amer. Math. Soc.*, 1990; 322(1): pp. 239-261.

Strauss H. "Unicity in $$$L_1$$$-approximation", *Math. Zeitschr.*, 1981; pp. 63-74. (in German)

Tkachenko M.Ye. "On unicity of the best $$$L_1$$$-approximant with coefficient constraints for vector-valued functions", *Dnipr. Univ. Math. Bull.*, 2002; 7: pp. 92-102. (in Russian)

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