1. Unilasalle-Ecole des Métiers de l’Environnement, CYCLANN, Campus de Ker Lann, 35170 Bruz, France
2. INRAE, UR1466 OPAALE, 17 Avenue de Cucillé, 35044 Rennes, France
3. Institute of Mathematics and Statistics, Federal University of Bahia, Av. Adhemar de Barros s/n, Ondina, Salvador 40170-110, BA, Brazil
4. Department of Exact Sciences, University of São Paulo, Piracicaba 13418-900, SP, Brazil