[1] F. E. BROWDER D. G. de FIGUEIREDO: 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

[3] J. CRONIN: Fixed points and topological degree in nonlinear analysis. Amer. Math. Soc. 1964, Providence, R. I. MR 0164101 | Zbl 0117.34803

[4] N. DUNFORD J. T. SCHWARTZ: Linear Operators I. (Russian), Moscow 1962. MR 0216303

[5] D. G. de FIGUEIREDO: Fixed point theorems for nonlinear operators and Galerkin approximations. Journ. 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, Univ. of Maryland, 1967. Zbl 0176.45403

[7] D. G. de FIGUEIREDO: Topics in nonlinear analysis. Lecture Series, Univ. of Maryland, 1967.

[8] M. A. KRASNOSELSKIJ: Topological methods in the theory of nonlinear integral equations. (Russian), Moscow 1956.

[9] M. A. KRASNOSELSKIJ J. B. RUTICKIJ: Convex functions and Orlicz' spaces. (Russian), Moscow 1958.

[10] E. A. MICHAEL A. PELCZYNSKI: Separable Banach spaces which admit $l\sb{n}{}\sp{\infty }$ -approximations. Israel Math. J. (1966), 189-198. MR 0211247

[11] J. NEČAS: Sur l'alternative de Fredholm pour les opérateurs non-linéaires avec applications aux problèmes aux limites. Ann. Scuola Norm. Sup. Pisa XIII (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. Arch. Rat. Mech. Anal. 26 (1967), 43-49. MR 0220120 | Zbl 0166.12701

[14] W. V. PETRYSHYN: On the approximation-solvability of nonlinear equations. Math. Ann. 177 (1968), 156-164. MR 0226458 | Zbl 0162.20301

[15] S. I. POCHOŽAJEV: On the solvability of nonlinear equations with odd operators. (Russian), Funkcional. anal. i ego přilož. 1 (1967), 66-73. MR 0221344

[16] S. I. POCHOŽAJEV: O množestve kritičeskich značenij funkcionalov. Mat. sbornik 75 (1968), 106-111.

[17] S. SCHONEFELD: Schauder bases in spaces of differentiable functions. Bull. Amer. Math. Soc. 75 (1969), 586-590. MR 0244753 | Zbl 0201.16101

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