1. Berland, J.J.G., 1928. French Patent No. 635,283.
2. Fruchter, E., Grossman, G., and Zvirin, Y., 1983. Development of a Stationary reflector/tracking absorber solar collector for intermediate temperatures. In: Proceeding, the 1983 International Solar Energy Society Congress, vol. 3, Perth, Australia, August 15–19, pp. 1799–1803.
3. Fruchter, E., Grossman, G., Zvirin, Y., Baranover, H., 1985. A Spherical Concentrating Solar Collector Using Liquid Metals for intermediate temperatures. In: Proceeding, the 1985 International Solar Energy Society Congress, vol. 2, Montreal, Canada, June 23–29, pp. 1362–1367.
4. Grossman, G., 1998. Roof structure including concentrating solar collector units. Israel Patent No. 108, 110.
5. Development of a spherical reflector tracking absorber solar energy collector;Grossman;Israel J. Technol.,1979