KAILA, A. Determination of the degree of humification in peat samples. Agricultural and Food Science, [S. l.], v. 28, n. 1, p. 18–35, 1956. DOI: 10.23986/afsci.71402. Disponível em: https://journal.fi/afs/article/view/71402. Acesso em: 12 apr. 2025.