Nemati Kharat, Ali, and Leila Hamedinie. “Effect of Alkyl Chain Length of Quaternary Ammonium Salts on Pure Size Distribution and Surface Area of Sol-Gel Derived Alumina”. Asian Journal of Chemistry, vol. 18, no. 3, Mar. 2010, pp. 2242-8, https://asianpubs.org/index.php/ajchem/article/view/20981.