| Institution: | (1) Université Paris 7, UFR de Mathématiques, Case 7012, 2, place Jussieu, F-75251 Paris Cedex 05, France. e-mail: comets@math.jussieu.fr. Research partially supported by CNRS, UMR 7599. Part of this work was done while visiting the Dept. of Electrical Eng., Technion, Israel., FR;(2) Department of Mathematics, TU Berlin. Strasse des 17. Juni 135, D-10623 Berlin, GERMANY. e-mail: gantert@math.TU-Berlin.DE. Research supported by the Swiss National Science foundation under grant 8220-046518, and partially supported by the DFG. Part of this work was done while visting the Dept. of Electrical Eng., Technion, Israel., DE;(3) Department of Electrical Engineering, Technion-Israel Institute of Technology, Haifa 32000, ISRAEL. e-mail: zeitouni@ee.technion.ac.il. Partially supported by a US-Israel BSF grant and by IHP., IL |
