Veloso, R. F., Macgregor, M. J., Dent, J. B., & Thornton, P. K. (1994). System modelling techniques applied to agricultural planning in the cerrado region. Pesquisa Agropecuaria Brasileira, 29(12), 1877–1887. https://doi.org/10.1590/S1678-3921.pab1994.v29.4245