Affiliation: | a Departments of Physiology, Physics & Mathematics and Centre for Nonlinear Dynamics, McGill University, 3655 Promenade Sir William Osler, Montreal, QC, Canada H3G 1Y6 b Institute of Mathematics, University of Silesia, Bankowa 14, 40-007 Katowice, Poland c Université de Lyon CNRS Université Lyon 1, Institut Camille Jordan, 43 bd du 11 nov. 1918, F-69622 Villeurbanne Cedex, France |