1. A.W. Kaiser, H.J. Bornemann, R. Koch, Applied Superconductivity (1997), p. 837.
2. FZK/INFP, German Patent DE 196 01 771 C1.
3. http://www.infp.fzk.de/wheel/english/home.htm.
4. P.F. Herrmann, to be published in the Handbook of Applied Superconductivity, Alcatel/Marcoussis, France (1997).
5. HTc pour la limitation du courant