GHABBOUR, Elham A.; DAVIES, Geoffrey. Spectrophotometric Analysis of Fulvic Acid Solutions - A Second Look. Annals of Environmental Science, [S. l.], v. 3, 2009. Disponível em: https://openjournals.neu.edu/aes/journal/article/view/v3art2. Acesso em: 27 apr. 2024.