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3. M. A. Krasnosel'skii, Topological Methods in the Theory of Nonlinear Integral Equations [in Russian], Gostekhizdat, 1956.
4. M. A. Krasnosel'skii, Positive Solutions to Operator Equations [in Russian], Fizmatgiz, 1962.
5. F. Wei and W. Prater, ?A new approach to first order chemical reaction systems,? Amer. Inst. Chem. Engrs. J., vol. 9, no. 1, p. 30, 1963.