1. Some aspects of the mathematical theory of control processes;Bellman;The RAND Corporation, R-313,1958
2. The Mathematical Theory of Optimal Processes;Pontryagin,1962
3. Adaptive control processes: A guided tour;Bellman;The RAND Corporation, R-350,1961
4. also published by Princeton Univ. Press, Princeton, New Jersey, 1961.
5. Vorlesungen über Variationsrechnung;Bolza,1949