https://pubs.acs.org/doi/pdf/10.1021/jo010535q (Publisher version)
Fey, T., Fischer, H., Bachmann, S., Albert, K., & Bolm, C. (2001). Silica-Supported TEMPO Catalysts: Synthesis ad Application in the Anelli Oxidation of Alcohols. Journal of Organic Chemistry, 66(24), 8154-8159. doi:10.1021/jo010535q.