1. An investigation of switching criteria for higher-order contactor servomechanisms;Bogner;Trans. Amer. Inst. elec. Engrs,1954
2. Theoretical Aspects of Limit Control;Rose,1953
3. On the bang-bang control problem;Bellman;Quart. Appl. Math.,1956
4. Differential equations with a discontinuous forcing term.;Bushaw,1953
5. Paper on Optimum Control presented at the International Congress of Mathematics;Pontriagin,1958