[1] H. AMANN: Hammersteinsche Gleichungen mit kompakten Kernen. Math. Ann. 186 (1970), 334-340. MR 0278138

[2] H. BRÉZIS: Equations et inéquations non-linéaires dans les espaces vectoriels en dualité. Ann. de l'Institut Fourier (Grenoble) 18 (1968), 115-175. MR 0270222

[3] F. E. BROWDER C. P. GUPTA: Monotone operators and non-linear integral equation of Hammerstein type. Bull. Amer. Math. Soc. 75 (1968), 1347-1353. MR 0250141

[4] F. E. BROWDER: Nonlinear Functional Analysis and Nonlinear Integral Equations of Hammerstein and Urysohn Type. Contributions to Nonlinear Functional Analysis Pub. No. 27 (1971), 425-501. MR 0394340 | Zbl 0267.47038

[5] D. de FIGUEIREDO C. P. GUPTA: Nonlinear Integral Equation of Hammerstein type involving unbounded monotone linear mappings. J. Math. Anal, Appl. 39 (1972), 37-48. MR 0305167

[6] W. V. PETRYSHYN P. M. FITZPATRIK: New existence theorems for nonlinear equations of Hammerstein type. Trans. Amer. Math. Soc. 160 (1971), 39-63. MR 0281065