1. Nonlinear Techniques for Improving Servo Performance;McDonald,1950
2. Equivalent Linearization, Nonlinear Circuit Synthesis and the Stabilization and Optimization of Control Systems;Bass,1956
3. Optimal Discontinuous Forcing Terms;Bushaw,1958
4. On the Bang Bang Control Problem;Bellman;Quart. J. Appl. Math.,1956
5. The Bang Bang Servo Problem Treated by Variational Techniques;Desoer;Information and Control,1959