Wu, Li, Ze-Min Song, Yong-An Chen, Hong-Ying Zhu, Zhang-Hai Li, Yun Gao, Jun Yang, and Yi-De Hung. “Ion Chromatographic Determination of Nitrite and Nitrate in Tobacco Leaf”. Asian Journal of Chemistry 25, no. 17 (November 11, 2013): 9520–9522. Accessed May 3, 2024. https://asianpubs.org/index.php/ajchem/article/view/25_18_22.