1. A M Dykhne, Zh. Eksp. Teor. Fiz. 59, 110 (1970); Sov. Phys. JETP 63, 348 (1971)
2. A M Fokin, Uspekhi Fiz. Nauk 166, 10169 (1996)
3. The quantum Hall effect edited by R E Prange and S M Gurvin (Springer, Berlin, 1987)
4. Ya Balagurov, Zh. Eksp. Teor. Fiz. 82, 1333 (1982)
5. V E Arkhincheev and E G Batyev, Solidi State Commun. 71(12), 1059 (1989)