ZHOU, YUANQING, ZHAOLU WU, XUEBING ZHAO, and DENGGAO FU. “Solid-Phase Extraction and Spectrophotometric Determination of Mercury With 6-Mercaptopurine in Tobacco and Tobacco Additive”. Asian Journal of Chemistry 19, no. 7 (March 30, 2010): 5548–5554. Accessed October 3, 2024. https://asianpubs.org/index.php/ajchem/article/view/13167.