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2. Functional equations in the theory of dynamic programming, V. Positivity and quasi-linearity;Bellman;Proc. natl. Acad. Sci. U.S.,1955
3. Functional equations in the theory of dynamic programming, II. Nonlinear differential equations;Bellman;Proc. natl. Acad. Sci. U.S.,1955
4. “Dynamic Programming.”;Bellman,1957
5. Successive approximations and computer storage problems in ordinary differential equations;Bellman;Communs. Assoc. Computing Machinery,1961