[2] G.H. Döhler, IEEE J. Quantum Electronics 22, 1682 (1986)
[3] E. F. Schubert, J. Vac. Sci. Technol. A 8 2980 (1990)
[4] E. F. Schubert, Surface Science 228, 240 (1990)
[5] E.F. Schubert and T.D. Harris, Appl. Phys. Lett. 53 (22), 1988
[6] B.Tranta, H.Clemens, Lecture Notes in Physics 301, 281-285, Springer 1988
[7] D.L. Partin and C.M. Thrush, J. Appl. Phys. 66 (12), 6115-6120, (1989)
[8] J. Oswald, B.Tranta, M.Pippan, G.Bauer, J. Optical and Quantum Electronics 22 243-259 (1990)