On a surjectivity theorem

[1] Aronsson, G., A note on the extension of Lipschitz and Holder functions (preprint, 5 p.)
[2] Aronsson, G., Extension of functions satisfying Lipschitz conditions, Arkiv for Mathematik 6, 28 (1967), 551-561.
[3] Gutier, S., Isac, G., Penot, J.P., Surjectivity of multifunctions under generalized differentiability assumptions, Bull. Austral. Math. Soc., 28 (1983), 13-21.
[4] Mustata, C., Best Approximation and Unique Exctension of Lipschitz Functions, Journal of Approx. Theory 19, 3 (1977), 222-230.
[5] Mustata, C., Extension of bounded Lipschitz functions “Babes-Bolyai” University, Faculty of Mathematics, Research Seminaries, Seminar of Funcitonal Analysis and Numerical Methods, Preprint nr.1, 1980, 1-20.
[6] Mc Shane, E.J., Extension of range of functions, Bull. Amer. Math. Soc. 40 (1934), 837-842.
[7] Singer, I., Cea mai bună aproximare în spații vectoriale normate prin elemente din subspații vectoriale, Editura Academiei R.S. România, București, 1067.