G. Scherowsky and M. Sefkow, “Stereoselective Synthesis of Optically Active Di- and Trisubstituted Oxetanones as Chiral Dopants to Induce Ferroelectricity in Liquid Crystals”, Chimia, vol. 47, no. 1-2, p. 19, Feb. 1993, doi: 10.2533/chimia.1993.19.