1. Dynamic Programming;Bellman,1957
2. On the “bang-bang” control problem;Bellman;Quart. Appl. Math.,1956
3. Lectures on the Calculus of Variations;Bliss,1946
4. The optimization of trajectories;Breakwell;J. Soc. Ind. Appl. Math.,1959
5. Optimal discontinuous forcing terms;Bushaw,1958