LI, D.L., Z.X. CHANG, J.Y. QU, X.M XU, and Z.J ZHANG. 2010. “UV-Spectrophotometric Determination of 3-Glycidoxypropyltrimethoxysilane (GPTMS) and Epoxy Groups on GPTMS Modified Nanosilica”. Asian Journal of Chemistry 21 (4):2667-72. https://asianpubs.org/index.php/ajchem/article/view/12476.