Lopes, José Dermeval Saraiva, Evandro Chartuni Mantovoni, Francisco de Assis Carvalho Pinto, and Daniel Marçal de Queiroz. “A Computer Program Development for Farm Machinery System Economics Selection”. Pesquisa Agropecuaria Brasileira 30, no. 4 (April 1, 1995): 537–542. Accessed November 15, 2025. https://apct.sede.embrapa.br/pab/article/view/4337.