Selections associated to McShane’s extension theorem for Lipschitz functions

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[5] Mc shane; E, J., Extensions of range of functions, Bull, Amer. Math. Soc. 40 (1934), 837-842.
[6] Mustata C., Best Approximation and Unique Extension of Lipschilz Functions’J.A.T. 19 (1977), 222-230.
[7] Mustata, C., M- ideals in metric spaccs, “Babes-Bolyai,, University, Fac. of Math. and Physics, Research Seminars, Seminar on Math. Anal., preprint Nr. 7 (1988), 65-74.
8. Rudin W., Functional Analysis, McGraw-Hill 1973.