1. School of Agricultural Engineering Univ. of Campinas (UNICAMP) Av. Cândido Rondon, 501 – Barão Geraldo CEP Campinas SP 13083‐875 Brazil
2. Faculty of Agricultural and Veterinary Sciences São Paulo State Univ. (UNESP) Rua Quirino de Andrade, 215 – Centro CEP Jaboticabal SP 01049‐010 Brazil
3. Interdisciplinary Center of Energy Planning Univ. of Campinas (UNICAMP) Rua Cora Coralina, 330 – Barão Geraldo CEP Campinas SP 13083‐896 Brazil
4. Dep. of Computer Science Federal Univ. of Technology of Paraná (UTFPR) Av. Brasil, 4232 CEP Medianeira PR 85884‐000 Brazil
5. School of Agricultural Engineering Univ. of Campinas (UNICAMP) Av. Cândido Rondon, 501, Barão Geraldo CEP Campinas SP 13083‐875 Brazil