Botteghi, Carlo, et al. “Asymmetric Synthesis by Chiral Ruthenium Complexes, I: Enantioselective Hydrogenation of Ketones and Ketoximes Catalyzed by H4Ru4(CO)8[(—)-DIOP]2”.
CHIMIA, vol. 29, no. 6, June 1975, p. 256,
https://doi.org/10.2533/chimia.1975.256.