Institution: | 1. Université de Lyon, CNRS, Université Lyon 1, INSA de Lyon, Ecole Centrale de Lyon, CNRS, UMR 5208, Institut Camille Jordan, 43 bld. du 11 novembre 1918, F-69622 Villeurbanne Cedex, France;2. Department of Mathematics, Bucknell University, Lewisburg, PA 17837, USA;3. School of Mathematics, University of Leeds, Leeds LS2 9JT, United Kingdom |