Gabbasa, M. A., B. A. Salem, and M. M. Alajami. “Measuring the Concentration of Preservative Benzoic Acid of Tomato Paste Samples by Spectrophotometer Analyzer”. University of Zawia Journal of Natural Sciences, vol. 2, no. 1, month-03 2025, pp. 20-25, doi:10.26629/uzjns.2025.04.