PERSSON, J. Humusbalans i odlad jord . Agricultural and Food Science, [S. l.], v. 46, n. 3, p. 247–263, 1974. DOI: 10.23986/afsci.71882. Disponível em: https://journal.fi/afs/article/view/71882. Acesso em: 12 apr. 2025.