MARTTILA, U. Exchangeable cations in Finnish soils. Agricultural and Food Science, [S. l.], v. 37, n. 2, p. 148–161, 1965. DOI: 10.23986/afsci.71634. Disponível em: https://journal.fi/afs/article/view/71634. Acesso em: 26 jul. 2024.