1. Departamento de Energia; Universidad Autonoma Metropolitana de Azcapotzalco; Ciudad de Mexico; D.F.; 02200; Mexico
2. School of Electrical and Computer Engineering; National Technical University of Athens; GR-15780; Athens; Greece
3. Canada Research Chair on Insulating Liquids and Mixed Dielectrics for Electrotechnology (ISOLIME); Université du Québec à Chicoutimi; Québec; Canada