R. Birk, M. Karpf, K. Püntener, M. Scalone, M. Schwindt, and U. Zutter, “With Asymmetric Hydrogenation Towards a New, Enantioselective Synthesis of Orlistat”, Chimia, vol. 60, no. 9, p. 561, Sep. 2006, doi: 10.2533/chimia.2006.561.