1. For a recent extensive review on MBE see: The Technology and Physics of Molecular Beam Epitaxy, ed. by E.H.C. Parker (Plenum, New York 1985)
2. K.G. Günther: Z. Naturforschg. A 13, 1081 (1958)
3. J.R. Arthur: J. Phys. Chem. Solids 28, 2257 (1967)
4. J.R. Arthur: J. Appl. Phys. 39, 4032 (1968)
5. A.Y. Cho: J. Appl. Phys. 41, 782 (1970)