Institution: | Department of Mathematics and Statistics, McMaster University, Hamilton, Ontario, Canada L8S 4K1 Lia Bronsard ; Department of Mathematics and Statistics, McMaster University, Hamilton, Ontario, Canada L8S 4K1 Etienne Sandier ; Departement des Mathématiques, Université Paris XII, 64 avenue du Général de Gaulle, 94010 Créteil Cedex, France |