SINGH, S P; VATSA, D K; SINGH, H B. Effect of utilization and handling of tractors on their repair and maintenance under hilly conditions. Journal of Agricultural Engineering, India, v. 37, n. 1, 2000. Disponível em: https://epubs.icar.org.in/index.php/JAE/article/view/14068. Acesso em: 6 jun. 2026.