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García, N., Benito, E., Guzmán, J., & Tiemblo, P. (2007). Use ofp-Toluenesulfonic Acid for the Controlled Grafting of Alkoxysilanes onto Silanol Containing Surfaces:? Preparation of Tunable Hydrophilic, Hydrophobic, and Super-Hydrophobic Silica. Journal of the American Chemical Society, 129(16), 5052–5060. doi:10.1021/ja067987a 
10.1021/ja067987a