Yamamoto, Kazumasa, et al. “Radical Cyclization Vs. Elimination in the Vitamin-B₁₂-Catalyzed Reduction of Unsaturated Bromo Acetals and Bromo Orthoesters”. CHIMIA, vol. 45, no. 3, Mar. 1991, p. 86, https://doi.org/10.2533/chimia.1991.86.