1. FACIN - PUCRS -- Av. Ipiranga 6681, 90619-900, Porto Alegre, Brazil and LIRMM -- 161 rue Ada, Cedex 05, 34095 Montpellier, France
2. FACIN - PUCRS -- Av. Ipiranga 6681, 90619-900, Porto Alegre, Brazil
3. LIRMM -- 161 rue Ada, Cedex 05, 34095 Montpellier, France
4. University of Leicester - University Rd, Leicester LE1 7RH, United Kingdom