S. Kruanetr and K. Prasertboonyai*, “UV-Vis Spectrophotometric Method Using Natural Reagent from Vigna unguiculata subsp. sesquipedalis for Tetracycline Determination in Pharmaceutical Samples”, Curr. Appl. Sci. Technol., vol. 21, no. 1, pp. 51–64, Aug. 2020.