1. Hesse, J.: Japan, J. Appl. Phys. 16/1, 297 (1977)
2. Melngailis, I., Harman, T. C in: Semiconductors and Sernimetals, Vol. 5 (ed. Willardson, R. K., Beer, A. C.), p. 111, New York: Academic Press 1970
3. Long, D., Schmit, J. L.: ibid.Semiconductors and Sernimetals, Vol. 5 (ed. Willardson, R. K., Beer, A. C.), p. 111, New York: Academic Press 1970, p. 175
4. Harman, T. C., Melngailis, I. in: Applied Sol. State Science, p. 1, New York: Academic Press 1974
5. Dornhaus, R., Nimtz, G. in: Springer Tracts in Modern Physics, Vol. 78, p. 1, Heidelberg: Springer 1976