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2. Fei Zhou, B. Spivak and A. Zyuzin, Phys. Rev. B52, 4467 (1995).
3. I. G. A. Devyatov and M. Yu. Kupriyanov, JETP Lett.59, 200 (1994).
4. For review, see A. W. Kleinsasser and W. J. Gallagher inSuperconducting Devices, D. Rudmann and S. Ruggiero, eds., (Academic Press, Boston, 1989) p.325; and T. M. Klapwijk, Physica B197, 481 (1994).
5. For example, see B. G. Streetman,Solid State Electronic Devices (Prentice Hall, Englewood Cliffs, NJ, 1990).