Volumetric estimates in eucalyptus stands using support vector machines and artificial neural networks Awduron: Cordeiro, Marcio Assis, Arce, Julio Eduardo, Guimarães, Fabiane Aparecida Retslaff, Bonete, Izabel Passos, Silva, Anthoinny Vittória dos Santos, de Abreu, Jadson Coelho, Binoti, Daniel Henrique Breda