1. I.L. Ivanov, S.M. Ryvkin: Sov. Phys. — Tech. Phys. 3, 722 (1958)
2. R.D. Larrabee, M.C. Steele: J. Appl. Phys. 31, 1519 (1960)
3. 1. Proc. 5th Int'l Conf. on Semiconductor Physics, Prague, 1960 (Academic, New York 1961)
4. 2. Proc. 7th Int'l Conf. on the Physics of Semiconductors, Paris, 1964 (Academic, New York 1965)
5. 3. Proc. 9th Int'l Conf. on the Physics of Semiconductors, Moscow, 1968 (Nauka, Leningrad 1968)