Institution: | 1. Universidade de São Paulo, IME, Bloco A, 1010 Rua do Matão, Cidade Universitária, 05508-090 São Paulo, Brazil;2. Department of Mathematics and Computing, Institute of Technology, Tralee, Co. Kerry, Ireland;3. Université de Paris-Est Marne-la-Vallée, 5, bd Descartes, Champs-sur-Marne, 77454 Marne-la-Vallée cedex 2, France |