1. V. M. Andreev, V. A. Grilikhes, and V. D. Rumyantsev, Photoelectric Transformation of Concentrated Solar Radiation (Nauka, Leningrad, 1989).
2. A. Luque and G. L. Araujo, Solar Cells and Optics for Photovoltaic Concentration (Hilger, Bristol, 1989).
3. Zh. I. Alferov, V. M. Andreev, and V. D. Rumyantsev, Semiconductors 38, 899 (2004).
4. W. Guter, J. Schöne, S. P. Philipps, M. Steiner, G. Siefer, A. Wekkeli, E. Welser, E. Oliva, A. W. Bett, and F. Dimroth, Appl. Phys. Lett. 94, 223504 (2009).
5. http://www.greentechmedia.com/articles/read/Sharp-Hits Record-44.4-Efficiency-For-Triple-Junction-Solar-Cell