1. Graduate Program on Computational Modeling; Universidade Federal de Juiz de Fora; Juiz de Fora Brazil
2. Centro Federal de Educação Tecnológica de Minas Gerais (CEFET-MG); Leopoldina Brazil
3. Simula Research Laboratory; P.O. Box 134 1325 Lysaker Norway
4. Department of Informatics, University of Oslo; P.O. Box 1080, 0316 Oslo Norway
5. National Laboratory of Scientific Computing (LNCC); Petrópolis Brazil