On Changes in Concept and General Composition of Agricultural Tractors. Agricultural Engineering , [S. l.], v. 23, n. 2, p. 69–84, 2019. DOI: 10.1515/agriceng-2019-0018. Disponível em: https://ojs.agriceng.org/index.php/AgricEng/article/view/186.. Acesso em: 8 jan. 2025.