Al-Mukhaini, Nawal M., Taher A. Ba-Omar, Elsadig A. Eltayeb, and Aisha H. Al-Shehi. 2015. “Characterisation of Nicotine and Cancer-Enhancing Anions in the Common Smokeless Tobacco Afzal in Oman”. Sultan Qaboos University Medical Journal 15 (4):469-76. https://journals.squ.edu.om/index.php/squmj/article/view/2065.