José Domingo Álvarez Hervás,
            University of Almería, Spain
         
        
          Nicolás Calvo Cruz,
            University of Almería, Spain
         
        
          Florbela Pires Fernandes,
            Polytechnic Institute of Bragança, Portugal
         
        
          Eligius M. T. Hendrix,
            Universidad de Málaga, Spain
         
        
          José Lima,
            IPB, Portugal
         
        
          Pilar Martinez Ortigosa,
            University of Almería, Spain
         
        
          Maria F. Pacheco,
            Instituto Politécnico de Bragança, Portugal
         
        
          Savins Puertas Martin,
            University of Almería, Spain
         
        
          Ana Maria Alves Coutinho Rocha,
            Universidade do Minho, Portugal
         
        
          Ana Paula Teixeira,
            Universidade de Trás-os-Montes e Alto Douro, Portugal