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(L. Machado) Department of Mathematics University of Tra´s-os-Montes and Alto Douro 5001-813 Vila Real
Portugal.
E-mail address: lmiguel@utad.pt
(R. Sepulchre) Department of Electrical Engineering and Computer Science B28 University of Lie`ge
B-4000 Lie`ge Sart-Tilman
Belgium.
E-mail address: r.sepulchre@ulg.ac.be