R. Hongkrengkai, J. Tratip, S. Rittisak, and U. Kumtabtim, “METHOD DEVELOPMENT FOR METAL ANALYSIS USING BOUGAINVILLEA FLOWER EXTRACTS AND ULTRAVIOLET-VISIBLE SPECTROSCOPY TECHNIQUE”, SWU J. Sci. Technol., vol. 16, no. 31, January-June, pp. 1–15, Article 253637, Apr. 2024.