1. Institute of Chemistry, State University of Campinas, P.O. Box 6154, 13083-970 Campinas, SP, Brazil
2. Laboratory of Chemometrics in Natural Sciences (LQCN), Department of Chemistry, State University of Londrina, P.O. Box 6001, 86051-990 Londrina, PR, Brazil
3. Embrapa Florestas, P.O. Box 319, 83411-000 Colombo, PR, Brazil