1. See, for example, the Les Houches proceedings in The Physics and Fabrication of Microstructures and Microdevices (M. J. Kelly and C. Weisbuch, eds.), Springer, Berlin (1986) Proceedings of the Fourth International Conference on Molecular Beam Epitaxy (C. T. Foxon and J. J. Harris, eds.), in J. Cryst. Growth 81
2. M. J. Ludowise, J. Appl. Phys. 58, R31 (1985).
3. L. Esaki and R Tsu, Ibm J. Res. Dev. 14, 61 (1970)
4. R. Tsu and L. EsAki, AppL Phys. Lett. 22, 562 (1973)
5. L. L. Chang, L. EsAki, and R. Tsu, AppL Phys. Lett. 24, 593 (1974).