Institution: | (1) Department of Mathematics, Lund University, P.O. Box 118, 221 00 Lund, Sweden, e-mail: adrian.constantin@math.lu.se, SE;(2) Institute of Applied Mathematics, University of Hannover, Welfengarten 1, 30167 Hannover, Germany, e-mail: escher@ifam.uni-hannover.de, GY |