HUA, Li Cheng. Study of optimal design of parameters for spade punch planter of corn. agricultural engineering.eu, [S. l.], v. 56, n. SH1, p. 207–209, 2001. DOI: 10.15150/lt.2001.2140. Disponível em: http://195.37.233.11/landtechnik/article/view/2001-56-SH1-207-209. Acesso em: 5 mai. 2024.