KREULA, M.; ETTALA, T. Rehujen rikkipitoisuuksista . Agricultural and Food Science, [S. l.], v. 48, n. 4, p. 356–362, 1976. DOI: 10.23986/afsci.71925. Disponível em: https://journal.fi/afs/article/view/71925. Acesso em: 19 may. 2024.