1. Optimal control of solar energy and off-peak storage installations;Winn,1982
2. Control system analysis for off-peak auxiliary heating of passive solar systems;Murray,1980
3. The Mathematical Theory of Optimal Processes;Pontryagin,1962
4. Two Point Boundary Value Problems: Shooting Methods;Roberts,1972
5. Zaininger Engineering Co., May 11, 1981 (personal correspondence).