Gabbasa, Mohamed A, Badria A Salem, and Maryam M Alajami. “Measuring the Concentration of Preservative Benzoic Acid of Tomato Paste Samples by Spectrophotometer Analyzer”. University of Zawia Journal of Natural Sciences 2, no. 1 (March 15, 2025): 20–25. Accessed April 3, 2025. http://journals.zu.edu.ly/index.php/UZJNS/article/view/1035.