HEINONEN, R. Density, amount, and carbon content of organic matter in soils – some methodical reflections. Agricultural and Food Science, [S. l.], v. 32, n. 1, p. 125–127, 1960. DOI: 10.23986/afsci.71515. Disponível em: https://journal.fi/afs/article/view/71515. Acesso em: 4 may. 2024.