1. Proc. 10th Int. Conf. on Liquid and Amorphous Semiconductors;Löhneysen,1984
2. W.A. Phillips, these proceedings.
3. Amorphous Solids: Low Temperature Properties,1981
4. Specific Heat of Amorphous Germanium at Very Low Temperatures
5. A more detailed report of the a-Ge results will be presented elsewhere: R. van den Berg and H.v. Löhneysen, to be published.