1. I.M. Chapnik, Sov. Phys. Doklady 6, 988 (1962).
2. I.M. Chapnik, Phys. Lett. 72A, 255 (1979).
3. I.M. Chapnik, J. Phys. F 13, 975 (1983).
4. C.M. Hurd, “The Hall Effect in Metals and Alloys”, Plenum, New York, 1972, Chpt. 3.
5. I am told for example that B. Matthias was well aware of this rule (D. Wohlleben, private communication).