Mei, Luo, and Li Xiao Xuan. “Recent Progress of Symmetrically Substituted 1,1&Acute; -Binaphthyls for Asymmetric Catalytic Hydrogenation”. Asian Journal of Chemistry, vol. 18, no. 3, Mar. 2010, pp. 2089-06, https://asianpubs.org/index.php/ajchem/article/view/20964.