Institution: | 1.Department of Mathematics, University of Connecticut, 341 Mansfield Road, Storrs, CT, 06269-1009, USA ;2.Institut de Recherche Mathematique de Rennes, Universite de Rennes 1, Campus de Beaulieu, 35042, Rennes, France ;3.Purdue University, 150 N. University Street, West Lafayette, IN, 47907, USA ; |