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4. See, for instance, C. W. J. Beenakker and H. van Houten, Quantum Transport in Semiconductor Nanostructures in Solid State Physics, 44, Academic Press, 1991, edited by H. Ehrenreich and D. Turnbull
5. V. L. Gurevich, V. B. Pevzner and K. Hess, in Quantum Transport in Ultrasubmi-cron Devices, edited by D. K. Ferry, H. L. Grubin, C. Jacoboni and A.-P. Jauho ( Plenum Press, New York, 1995 )