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2017. CFIA-Turbidimetric and Photometric Determination of Vitamin B9 (Folic acid) Using LEDs as a Source of Irradiation and Two Solar Cells as an Energy Transducer. Baghdad Science Journal. 14, 4 (Dec. 2017), 0773. DOI:https://doi.org/10.21123/bsj.2017.14.4.0773.