1. Optimal control in bounded phase space;Chang;Automatica,1962
2. Optimal processes with bounded phase coordinates;Gamkrelidze;Izv. Akad. Nauk SSSR, Ser. Mat.,1960
3. The Mathematical Theory of Optimal Processes;Pontryagin,1962
4. Time optimal bounded phase coordinate control of linear systems, parts I, II, III;Russell;Honeywell MPG Report 12006-QR 1 (The First Quarterly Progress Report on Control NASw-986),1964
5. Optimal control for nonlinear processes;Lee;Arch. Rat. Mech. Anal.,1961