Setyawati, A. “Analysis Methods Verification of Boron in River Water Using the Uv-Vis Spectrophotometer With Curcumin Complex As Alternative Practical Educations”. IJCER (International Journal of Chemistry Education Research), vol. 3, no. 2, Feb. 2020, pp. 60-65, doi:10.20885/ijcer.vol3.iss2.art2.