1. Research Center of Semiconductor Devices; BUAP; Av. San Claudio y 14 Sur 72570 Puebla Mexico
2. Department of Electrical Engineering; CINVESTAV; Av. IPN No. 2508, A.P. 14-740 07300 Mexico Mexico
3. ICTEAM Institute; Université catholique de Louvain (UCL); Place du Levant 3 B-1348 Louvain-la-Neuve Belgium