Wang, Peng, et al. “Synthesis of Mesoporous G-Al2O3 Templated With Rosin-Based Quaternary Ammonium Salt by Ammonia Precipitation”. Asian Journal of Chemistry, vol. 24, no. 8, Apr. 2012, pp. 3439-44, https://asianpubs.org/index.php/ajchem/article/view/9390.