Al-Phalahy, Bashaer Abbas, et al. “Zwitterionic Ion Chromatography of Dansyl Amino Acids With 4-Vinylbenzyl Dimethyl Ammonio Pentanesulfonate As Stationary Phase”. Asian Journal of Chemistry, vol. 28, no. 11, Aug. 2016, pp. 2411-4, doi:10.14233/ajchem.2016.19993.