[1] S. BANACH:
Théorie des opérations linéaires. 1932, Warszawa.
Zbl 0067.08902
[2] N. DUNFORD J. T. SCHWARTZ:
Linear operators. Part I, 1958, Interscience Publishers, N. Y., London.
MR 0117523
[4] W. V. PETRYSHYN:
Remarks on fixed points theorems and their applications. Trans. Amer. Math. Soc. 126, 1967, 43-53.
MR 0217660
[5] M. M. VAJNBERG: Variacionnye metody issledovanija nelinejnych operatorov. 1956, Moskva.