1. Flat-plate collector for process heat with honeycomb cover—an alternative to vacuum tube collectors;Rommel,1987
2. Flat-plate collector with bifacially irradiated absorber;Goetzberger,1991
3. The bifacial-absorber collector: A new highly efficient flat-plate collector;Goetzberger,1991
4. Static concentration system with enhanced light concentration;Goetzberger,1988
5. Transparent insulation materials;Wittwer,1989