[1] J. KOLOMÝ: On the differentiability of mappings and convex functionals. Comment. Math. Univ. Carolinae 8 (1967), 735-752. A correction, this Journal 9 (1968), 197. MR 0243348

[2] J. KOLOMÝ: Remarks on nonlinear functionals. Comment. Math. Univ. Carolinae 9 (1969), 145-155. MR 0238076

[3] M. Z. NASHED: Some remarks on variations and differentials. Am. Math. Montly Vol. 73 1966, No 4, 63-76. MR 0198188 | Zbl 0141.11804

[4] M. M. VAJNBERG: Variacionnyje metody issledovanija nelinejnych operatorov. Moskva 1956.

[5] F. A. VALENTINE: Convex sets. New York 1964. MR 0170264 | Zbl 0129.37203

[6] N. BURBAKI: Topologičeskije vektornyje prostranstva. Moskva 1959.

[7] N. I. ACHIEZER I. M. GLAZMAN: Teorija linejnych operatorov v Gil'bertovom prostranstve. Moskva 1966.

[8] S. MAZUR: Über konvexe Mengen in linearen normierten Räumen. Studia Math. IV (1933), 70-84. Zbl 0008.31603

[9] A. ZYGMUND: Trigonometric series I. Cambridge 1959.

[10] A. ZYGMUND: Smooth functions. Duke Math. J. 12 (1945), 47-76. MR 0012691 | Zbl 0060.13806

[11] J. J. MOREAU: Sur la fonction polaire d'une fonction semicontinue supérieurement. C. R. Acad. Sci. Paris, 258 (1964), 1128-1131. MR 0160093 | Zbl 0144.30501

[12] G. J. MINTY: On the monotonicity of the gradient of a convex function. Pac. J. of Math. 14 (1964), 243-247. MR 0167859 | Zbl 0123.10601

[13] J. J. MOREAU: Sous-differentiabilité. Proc. Colloq. Convexity, Copenhagen 1965, Copenhagen 1967, 185-201. MR 0217598

[14] J. J. MOREAU: Fonctionelles sous-differentiables. C. R. Acad. Sci. 257 (1963), 4117-4119. MR 0158250

[15] A. BRØNDSTED R. T. ROCKAFFELAR: On the subdifferentiability of convex functions. Bull. Amer. Math. Soc. 16 (1965), 605-611. MR 0178103

[16] M. Z. NASHED: Supportably and weakly convex functions with application to approximation theory and nonlinear programming. Journal Math. Anal. and Appl. 18 (1967), No 3, 504-521. MR 0209839

[17] K. YOSIDA: Functional Analysis. Springer 1965. MR 0180824 | Zbl 0126.11504

[18] J. KOLOMÝ: On the differentiability of mappings in functional spaces. Comment. Math. Univ. Carolinae 8 (1967), 315-330. MR 0212569

[19] V. ZIZLER: On the differentiability of mappings in Banach spaces. Comment. Math. Univ. Carolinae 8 (1967), 415-430. MR 0227772 | Zbl 0179.19101

[20] J. KOLOMÝ V. ZIZLER: Remarks on the differentiability of mappings in linear normed spaces. Comment. Math. Univ. Carolinae 8 (1967), 691-704. MR 0234279

[21] M. A. KRASNOSELSKIJ: Topologičeskije metody v teorii nelinejnych integralnych uravnenij. Moskva 1956.

[22] R. I. KAČUROVSKIJ: O monotonnych operatorach i vypuklych funcionalach. Uspechi mat. nauk 15 (1960), No 4, 213-215. Učen. zap. Moskov. obl. ped. inst. N. K. Krupskoj, t. 110 (1962), vyp. 7, 231-243.

[23] M. M. VAJNBERG: Novyje teoremy dlja nelinejnych operatorov i uravnenij. Uč. zap. Moskov. obl. ped. inst. im. N. K. Krupskoj t. 77, vyp. 5, 131-143.