Henri B. Kagan, Dang-Tuan-Phat (1972). "Asymmetric catalytic reduction with transition metal complexes. I. Catalytic system of rhodium(I) with (−)-2,3-0-isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane, a new chiral diphosphine". Journal of the American Chemical Society. 94 (18): 6429-6433. doi:10.1021/ja00773a028.