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This research was supported by N. A. S. A. contract No. NGR-45-003-038.
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Schmitt, K. Boundary value problems for nonlinear second order differential equations. Monatshefte für Mathematik 72, 347–354 (1968). https://doi.org/10.1007/BF01302169
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DOI: https://doi.org/10.1007/BF01302169