G. P. Villibor, F. L. Santos, D. M. de Queiroz, e D. M. Guedes, “<b>Vibration levels on rear and front axles of a tractor in agricultural operations</b> - doi: 10.4025/actascitechnol.v36i1.18170”, Acta Sci. Technol., vol. 36, nº 1, p. 7–14, jan. 2014.