1. R. Bellman, Dynamic Programming, Princeton Univ. Press, Prinston N.J., 1957.
2. R. Bellman and R. Kalaba, Quasilinearization and Nonlinear Boundary-value Problems, American Elsevier, N.Y., 1965
3. R. Bellman and Wm. Karush, On a new functional transform in analysis: the maximum transform, Bull. Amer. Math. Soc. 67 (1961), 501–503.
4. R. Bellman and Wm. Karush, Mathematical programming and the maximum transform, J. SIAM Appl. Math. 10 (1962), 550–567.
5. R. Bellman and Wm. Karush, On the maximum transform and semi-groups of transformations, Bull. Amer. Math. Soc. 68 (1962), 516–518.