1. The University of Texas at Dallas,Department of Electrical and Computer Engineering,Texas,USA
2. Pontificia Universidade Catolica de Campinas,Department of Electrical Engineering,Campinas,Brazil
3. Universidad San Francisco de Quito USFQ,Colegio de Ciencias e Ingenierías,Quito,Ecuador,170157
4. State University of Campinas,School of Electrical and Computer Engineering,Campinas,Brazil