Affiliation: | (1) DEIO, Faculdade de Ciências de Lisboa, Bloco C2, Piso 2, Campo Grande, 1749-016 Lisboa, Portugal;(2) Department of Econometrics, Faculty of Economics, Erasmus University Rotterdam, P.O. Box 1738, 3000 DR Rotterdam, The Netherlands;(3) School of Mathematics, Georgia Institute of Technology, 686 Cherry Street, Atlanta, GA 30332-0160, USA |