GAN, Daqing; KOTOB, Shaban I.; WALIA, Daman S. Evaluation of a Spectrophotometric Method for Practical and Cost Effective Quantification of Fulvic Acid. Annals of Environmental Science, [S. l.], v. 1, 2007. Disponível em: https://openjournals.library.northeastern.edu/aes/journal/article/view/v1art2. Acesso em: 4 may. 2024.