by Brunner, J., Jung, W., Schittenhelm, P., Gail, M., Abstreiter, G., Gonderman, J., Hadam, B., Koester, T., Spangenberg, B., Roskos, H.G., Kurz, H., Gossner, H., Eisele, I.
Published in Journal of crystal growth (01.12.1995)