[1] M. ALTMAN: Fixed Point Theorem in Hilbert Space. Bull. Acad. Pol. Sci. 5 (1957), 1, 19-29. MR 0087064 | Zbl 0077.31902

[2] F. E. BROWDER: Variational Boundary Value Problems for Quasi-linear Elliptic Equations, III. Proc. Nat. Acad. Sci. U. S. A. 50 (1963), 5, 794-798. MR 0166476 | Zbl 0158.12302

[3] F. E. BROWDER: Problèmes Non-linéaires. Les Presses de l'Université de Montréal (1966). Zbl 0153.17302

[4] F. E. BROWDER D. G. de FIGUEIREDO: J-monotone nonlinear operators in Banach spaces. Konkl. Nederl. Acad. Wetensch. 69 (1966), 412-420. MR 0205122

[5] J. CRONIN: Fixed Points and Topological Degree in Nonlinear Analysis. Am. Math. Soc. 1964. MR 0164101 | Zbl 0117.34803

[6] D. G. de FIGUEIREDO: Fixed-Point Theorems for Nonlinear Operators and Galerkin Approximations. Journ. Diff. Eq. 3 (1967), 2, 271-281. MR 0206761 | Zbl 0149.10604

[7] D. G. de FIGOEIREDO: Some Remarks on Fixed Point Theorems for Nonlinear Operators in Banach Spaces. Lecture Series, University of Maryland 1967.

[8] D. G. de FIGUEIREDO: Topics in Nonlinear Functional Analysis. Lecture Series, University of Maryland 1967.

[9] R. I. KAČUROVSKIJ M. A. KRASNOSELSKIJ P. P. ZABREJKO: Ob odnom principe nepodvižnoj točki dlja operatorov v gilbertovom prostranstve. Funkcionalnyj analiz i evo priloženija, 1 (1967), 1, 93-94.

[10] S. KAKUTANI: Topol. properties of the unit sphere in Hilbert space. Proc. Imp. Acad. Tokyo, 19 (1943), 269-271. MR 0014203

[11] J. KOLOMÝ: A note on the continuity properties of nonlinear operators. Comment. Math. Univ. Carolinae 8, 3 (1967), 503-514. MR 0222726

[12] W. V. PETRYSHYN: Remarks on Fixed Point Theorema and Their Extensions. Trans. Am. Math. Soc. 126 (1967), 1, 43-53. MR 0217660