Bending stiffness evaluation of Teca and Guajará lumber through tests of transverse and longitudinal vibration - Carreira, Marcelo Rodrigo; Segundinho, Pedro Gutemberg de Alcântara; Lahr, Francisco Antonio Rocco; Dias, Antônio Alves; Calil Júnior, Carlito (Acta Scientiarum. Technology, 2012)