1. Federal Institute of ParanáLondrina Brazil
2. Institute of InformaticsUniversidade Federal do Rio Grande do SulBrazil
3. Dept. of Computer Science and EngineeringUniversity of MinnesotaMinneapolis MN USA
4. Department of Computer ScienceUniversity of ChesterCheshire UK
5. Natural Phenomena Simulation Group, D.R. Cheriton School of Computer ScienceUniversity of WaterlooCanada