SALO, M.-L.; KOTILAINEN, K. Determination of free and combined plant acids. Agricultural and Food Science, [S. l.], v. 41, n. 4, p. 277–289, 1969. DOI: 10.23986/afsci.71745. Disponível em: https://journal.fi/afs/article/view/71745. Acesso em: 19 may. 2024.