[1] ISEP P Porto, Sch Engn Plytech Porto, Dept Mech Engn, Porto, Portugal
[2] Univ Aberta UAb, Dept Sci & Technol, Lisbon, Portugal
[3] NOVA Univ Lisbon, Sch Sci & Technol, Lisbon, Portugal
[4] Univ Lisbon, Fac Ciencias, Lisbon, Portugal
[5] Inst Politecn Castelo Branco, Castelo Branco, Portugal
[6] Univ Aberta, Lisbon, Portugal
[7] Univ Aberta UAb, Dept Social Sci & Management, Lisbon, Portugal