Nguyen, V., L. Nguyen, G. Nguyen, D. Nguyen, and M. Nguyen. “Controlling the Retention and Separation of Water–soluble Vitamins on Zwitterion Column by Hydrophilic Interaction Echanism”. VNUHCM Journal of Science and Technology Development, Vol. 19, no. 4, Dec. 2016, pp. 113-22, doi:https://doi.org/10.32508/stdj.v19i4.659.