| Dr. C.M. Murea - |
| University of Bucharest,Faculty of Mathematics |
| 14, str. Academiei, |
| 70109 Bucharest, |
| Romania, |
| fax & telephone: +40-1-312.11.63 |
| E-mail address: Cornel.Murea@math.unibuc.ro |
| http://tempus.math.unibuc.ro/~murea |
| P. Mader - |
| Dept. Antennes Spatiales d'Alcatel Espace, |
| 26, Av. J.F. Champollion, |
| 31037 Toulouse Cedex, |
| France |