Jenkinson, Sarah F., and George w. J. Fleet. “Oxetanes from the Ring Contraction of ?-Triflates of ?-Lactones: Oxetane Nucleosides and Oxetane Amino Acids”. CHIMIA, vol. 65, no. 1-2, Feb. 2011, p. 71, doi:10.2533/chimia.2011.71.