1. For the Hall effect measurements of hot electrons at higher temperatures above 77K, see, for example, [2–4]
2. H. Heinrich, E. Müller: In Proc. 9th Intern. Conf. Physics of Semiconductors, Moscow, 1968 (Nauka, Leningrad 1968), pp. 990–995
3. H. Heinrich, K. Lischka: Phys. Rev. B2, 2009–2016 (1970)
4. M. Kriechbaum, H. Heinrich, J. Wajda: J. Phys. Chem. Solids33, 829, 839 (1972)
5. S. Komiyama, R.Spies: Phys. Rev. B (1981) (in press)