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2. — Rheinboldt, W. C.: Numerical analysis and functional analysis, chap. 14 of Survey of numerical analysis, J. Todd, ed. New York: McGraw Hill 1962.
3. Athans, M., Falb, P. L.: Optimal control: an introduction to the theory and its applications. New York: McGraw Hill 1966.
4. Bellman, R. E., Kalaba, R. E.: Quasilinearization and nonlinear boundary-value problems. New York: American Elsevier Publishing Co., Inc. 1965.
5. Bosarge, W. E., Jr.: Some numerical results for iterative continuation in nonlinear boundary-value problems. IBM Journal of Research and Development, July 1971.