1. University of São Paulo, Av. Duque de Caxias Norte 225, 13635-900, Brazil. sergiodavid@usp.br
2. Institute of Engineering, Polytechnic of Porto, Rua Dr. António B. de Almeida 431, 4249-015, Porto, Portugal. jtm@isep.ipp.pt
3. University of Illinois at Urbana-Champaign, 1304 W. Pennsylvania Av. Urbana, IL 61801, USA. trevisa2@illinois.edu
4. University of São Paulo, Av. Duque de Caxias Norte 225, 13635-900, Brazil. claudio.inacio@usp.br
5. UISPA - LAETA/INEGI, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal. aml@fe.up.pt