1. Applied Physics Department, Universidad Politécnica de Cartagena, 30202 Cartagena, Murcia, Spain
2. INEGI, Instituto de Engenharia Mecânica e Gestão Industrial, Campus da FEUP, Rua Dr. Roberto Frias 400, 4200-465 Porto, Portugal
3. Applied Physics Department, Universidad de Granada, 18071 Granada, Spain