Q.-B. Lin, L.-L. Che, J. Guo, L.-F. Cai, and R.-Z. Wang, “Development of 4-Chloro-3,5-dinitrobenzotrifluoride Derivatization and Ultrahigh-performance Liquid Chromatography Method for Determination of 20 Free Amino Acids in Mature Vinegar”, ajc, vol. 26, no. 13, pp. 3909–3916, Jun. 2014.