1. F. Hoyle, Mon. Not. R. Astron. Soc. 106, 343 (1946)
2. F. Hoyle, E.M. Burbidge, G.R. Burbidge, W. Fowler, Rev. Mod. Phys. 29, 547 (1957)
3. K. Lark-Horowitz, in Proc. Conf. Semiconducting Materials, Reading, UK (Butterworth, London, 1951), p. 47
4. Materials Science and Technology;J.G. Wilkes,1996
5. T.D. Yensen, Elec. J. (March 1921)