Bichard, Claire J. F.; Fairbanks, Antony J.; Fleet, George W. J.; Ramsden, Nigel G.; Vogt, Klaus; et al. Tetrahedron: Asymmetry, 1991, vol. 2, # 9 p. 901 - 912 doi: 10.1016/S0957-4166(00)82202-8