1. L. Esaki: Phys. Rev. 109, 603 (1958)
2. W.K. Chow: Principles of Tunnel Diode Circuits (Wiley, New York 1964) (review)
3. S.M. Sze: Physics of Semiconductor Devices (Wiley, New York 1969)
4. D. Bohm: Quantum Theory (Prentice Hall, Englewood Cliffs, NJ 1951)
5. E.O. Kane: J. Appl. Phys. 32, 83 (1961);