R. de A. Almeida, P. G. F. Leão, L. C. Barcellos, and J. G. da Silva, “DEVELOPMENT AND EVALUATION OF AN ANIMAL-TRACTION PLANTER”, Pesq. Agropec. Trop., vol. 32, no. 2, pp. 81–87, Nov. 2007, doi: 10.5216/pat.v32i2.2413.