Jefford, Charles W., et al. “Photo-Oxygenation of Indene and 1,2-Dihydronaphthalene: Formation of 1,2-Dioxetanes and 1,2,4-Trioxanes”. CHIMIA, vol. 46, no. 4, Apr. 1992, p. 114, https://doi.org/10.2533/chimia.1992.114.