El-Hendawi, H.M., et al. “Diastereoselective Synthesis of Chiral Bicycle Phosphoramides Derived from (S)-2-(Anilinomethyl) Pyrrolidine”. Asian Journal of Chemistry, vol. 11, no. 4, Mar. 2010, pp. 1334-42, https://asianpubs.org/index.php/ajchem/article/view/23490.