[1] N. ARONSZAJN: Differentiability of Lipschitzian mappings between Banach spaces. Studia Math. 57 (1976), 147-190. MR 0425608 | Zbl 0342.46034

[2] F. E. BROWDER: Multivalued monotone nonlinear mappings and duality mapping in Banach spaces. Trans. Amer. Math. Soc. 118 (1965), 338-351. MR 0180884

[3] M. FABIÁN: On singlevaluedness and (strong) upper semicontinuity of maximal monotone mappings. Comment. Math. Univ. Carolinae 18 (1977), 19-39. MR 0442764 | Zbl 0347.47027

[4] P. S. KENDEROV: Monotone operators in Asplund spaces. preprint. MR 0463981 | Zbl 0377.47036

[5] E. J. Mc SHANE: Extension of range of functions. Bull. Amer. Math. Soc. 40 (1934), 837-842. MR 1562984

[6] G. J. MINTY: On the extension of Lipschitz, Lipschitz-Hölder continuous and monotone functions. Bull. Amer. Math. Soc. 76 (1970), 334-339. MR 0254575 | Zbl 0191.34603

[7] H. ROBERT: Une généralisation aux operateurs monotones des théorèmes de différentiabilité d'Asplund. Lecture Notes in Economics and Math. Systems vol. 102, Springer-Verlag 1974, 168-178. MR 0482398 | Zbl 0301.47040

[8] L. ZAJÍČEK: On the differentiation of convex functions in finite and infinite dimensional spaces. to appear in Czechoslovak Math. J. MR 0536060

[9] E. H. ZARANTONELLO: Dense single-valuedness of monotone operators. Israel J. Math. 15 (1973), 158-166. MR 0324490 | Zbl 0274.47028