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[2] R. McGill P. Kenneth: A convergence theorem on the iterative solution of nonlinear two-point boundary-value systems. Presented on the IAF Congress, Paris, September 1963.

[3] Л. В. Канторович Г. П. Акилов: Функциональный анализ в нормированных пространствах. Физматгиз, Москва 1959. Zbl 1234.81002