| Rainald FlumePhysikalisches Institut der Universität Bonn Nußallee 12 D-53115 Bonn Federal Republic of Germany 
 If you would like to contact me just send an e-mail to flume@th.physik.uni-bonn.de | 
| Secretary: | P. Zündorf | 
| Phone: | +49-228-73-3247 | 
| Fax: | +49-228-73-3223 |