Volikov, A., Ponomarenko, S., Konstantinov, A., Hatfield, K., & Perminova, I. (2016).
Nature-like solution for removal of direct brown 1 azo dye from aqueous phase using humics-modified silica gel.
Chemosphere, 145, 83-88. doi:10.1016/j.chemosphere.2015.11.070.