MÄKITIE, O. On the cobalt/nickel ratio in arable soils. Agricultural and Food Science, [S. l.], v. 34, n. 1, p. 91–95, 1962. DOI: 10.23986/afsci.71570. Disponível em: https://journal.fi/afs/article/view/71570. Acesso em: 5 may. 2024.