[1] F. E. Browder-D. G. de Figueredo: $J$-monotone Nonlinear Operators in Banach Spaces. Konkl. Nederl. Acad. Wetensch. 69, 1966, 412-420. MR 0205122

[2] F. E. Browder, W. V. Petryshyn: The Topological Degree and Galerkin Approximations for Noncompact Operators in Banach Spaces. Bull. Amer. Math. Soc. 74, 1968, 641-646. MR 0229100 | Zbl 0164.17003

[3] J. Cronin: Fixed Point and Topological Degree in Nonlinear Analysis. Amer. Math. Soc. 1964, Providence, Rhode Island. MR 0164101

[4] N. Dunford, J. T. Schwartz: инейные операторы I. Moscow 1962.

[5] D. G. de Figueiredo: Fixed-Point Theorems for Nonlinear Operators and Galerkin Approximations. Jour. Diff. Eq. 3, 1967, 271 - 281. MR 0206761 | Zbl 0149.10604

[6] D. G. de Figueiredo: Some Remarks on Fixed Point Theorems for Nonlinear Operators in Banach Spaces. Lecture Series, University of Maryland, 1967. Zbl 0176.45403

[7] D. G. de Figueiredo: Topics in Nonlinear Analysis. Lecture Series, University of Maryland, 1967.

[8] M. A. Kpaсносельский: Tonoлогические методы в теории нелинейных интегральных уравнений. Mocквa 1956.

[9] M. A. Kpacноселский, Я. Б. Pymский: Выпуклые функции в пространствах Орлича. Mocквa 1958.

[10] E. A. Michael-A. Pelczynski: Separable Banach Spaces which admit $l_n^{\infty}$-approximations. Israel Math. Jour. 1966, 189-198. MR 0211247

[11] J. Nečas: Sur l'alternative de Fredholm pour les operateurs non-lineaires avec applications aux problemes aux limites. Ann. Scuola Norm. Sup. Pisa XXIII, 1969, 331 - 345. MR 0267430 | Zbl 0187.08103

[12] W. V. Petryshyn: On a Fixed Point Theorem for Nonlinear $P$-compact Operators in Banach space. Bull. Amer. Math. Soc. 72, 1966, 329-334. MR 0193548 | Zbl 0142.11201

[13] W. V. Petryshyn: Remarks on the Approximation-Solvability of Nonlinear Functional Equations. Archive Rat. Mech. Anal. 26, 1967, 43-49. MR 0220120 | Zbl 0166.12701

[14] W. V. Petryshyn: On the Approximation-Solvability of Nonlinear Equations. Math. Annalen. 177, 1968, 156-164. MR 0226458 | Zbl 0162.20301

[15] C. И. Пoxoжaeв: Peшeниe нeлинeйныx ypaвнeний c чeтными oпepaтopaми. Фyнкц. aнaлиз и eгo пpилoжeния 1,1967, 66-73.

[16] C. И. Пoxoжaeв: O мнoжecтвe кpитичecкиx знaчeний фyнкциoнaлoв. Maт. cбopник 75, 1968, 106-111. MR 0221534

[17] S. Schonefeld: Schauder Bases in Spaces of Differentiable Functions. Bull. Ameг. Math. Soc. 75, 1969,586-590. MR 0244753 | Zbl 0201.16101

[18] M. M. Baйнбepг: Bapиaциoнныe мeтoды иccлeдoвaния нeлинeйныx oпepaтopoв. Mocквa 1956.

[19] J. Nečas: Les méthodes directes en théorie des équations elliptiques. Praha 1967. MR 0227584

[20] M. Kučera: Fredholm Alternative for Nonlinear Operators. Comment. Math. Univ. Carolinae 11, 2, 1970, 337-363. MR 0267429