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Ana Isabel Pereira Polytechnic Institute of Bragança Address: IPB – ESTiG, Gab 54 Campus de Sta Apolónia 5300- 253 Bragança - Portugal Phone: +351 273303106 E-mail: apereira@ipb.pt |
Maria Fernanda P. Costa University of Minho Address: Department of Mathematics and Applications, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal Phone: +351 253 510 435 E-mail: mfc@math.uminho.pt |