Hongkrengkai, Rattapon, Jutamanee Tratip, Supawinee Rittisak, and Usarat Kumtabtim. “METHOD DEVELOPMENT FOR METAL ANALYSIS USING BOUGAINVILLEA FLOWER EXTRACTS AND ULTRAVIOLET-VISIBLE SPECTROSCOPY TECHNIQUE”. Srinakharinwirot University Journal of Sciences and Technology 16, no. 31, January-June (April 30, 2024): 1–15, Article 253637. accessed August 29, 2026. https://ph02.tci-thaijo.org/index.php/swujournal/article/view/253637.