Yanai, Kiyoshi, Gastão Moraes da Silveira, Kleber Pereira Lanças, Ila Maria Corrêa, and José Valdemar Gonzalez Maziero. 1999. “Operational Performance of a Tractor With and Without the Use of Wheel Assist Drive”. Pesquisa Agropecuaria Brasileira 34 (8):1427-34. https://doi.org/10.1590/S1678-3921.pab1999.v34.5353.