1. ESTSetubal, Instituto Politecnico Setubal CTS/UNINOVA,Department of Electrical Engineering Sustain.RD,Setubal,Portugal
2. ADEEEA, LCEC ISEL, Instituto Politecnico de Lisboa INESC-ID Lisboa,Lisboa,Portugal
3. Department of Electrical Engineering FCT/UNL CTS/UNINOVA,Caparica,Portugal