HEINONEN, R. Suomen maalajien ominaispainosta. Agricultural and Food Science, [S. l.], v. 29, n. 1, p. 38–40, 1957. DOI: 10.23986/afsci.71431. Disponível em: https://journal.fi/afs/article/view/71431. Acesso em: 18 apr. 2025.