1. L.M. Fraas, R.C. Knechtli, Design of high efficiency monolithic stacked multijunction solar cells, in 13th IEEE Photovoltaic Specialist Conference, p. 886 (1978)
2. L.M. Fraas, J. Avery, H. Huang, L. Minkin, E. Shifman, Demonstration of a 33 % efficient cassegrainian solar module”, in 4th World Conference on PV, Hawaii (2006)
3. L. Fraas, J. Avery, J. Gee, K. Emery, et al., Over 35 % efficient GaAs/GaSb stacked concentrator cell assemblies for terrestrial applications, in 21st IEEE PV Specialist Conference, p. 190 (1990)
4. R. P. Feynman, R. B. Leighton, M. Sands, The Feynman Lectures on Physics, 3 Vols (Addison-Wesley, New York, 1965)
5. H.J. Hovel, J.M. Woodall, High efficiency AlGaAs-GaAs solar cells. Appl. Phys. Lett. 21, 379–381 (1972)