Tabthasong, T. and Kuengklang, S. (2025) “THE MEASUREMENT OF METAL IONS USING LAGERSTROEMIA SPECIOSA (L.) PERS. FLOWER EXTRACTS WITH DIGITAL IMAGE COLORIMETRY TECHNIQUES ON SMARTPHONES ”, PSRU Journal of Science and Technology. Phitsanulok, Thailand, 10(3), pp. 35–54. available at: https://ph01.tci-thaijo.org/index.php/Scipsru/article/view/259968 (accessed: 16 September 2026).