Kim, Chang-Yeoul, and A. Rum Jang. “Control of Flexibility and Pore Structure of Tetraethylorthosilicate Methyltriethoxysilane Aerogels by Hybridization”. Asian Journal of Chemistry, vol. 24, no. 9, May 2012, pp. 4217-24, https://asianpubs.org/index.php/ajchem/article/view/9586.