M. Bilal, Ammar, and Wadala A. Bashir. “Photometric Assay of Nitrite in Various Samples”. Rafidain Journal of Science 24, no. 2 (February 1, 2013): 60–83. Accessed September 10, 2025. https://edusj.uomosul.edu.iq/index.php/rsci/article/view/47692.