Longbottom, Deborah A., Vilius Franckevičius, and Steven V. Ley. 2007. “(S)- and (R)-5-Pyrrolidin-2-Yl-1H-Tetrazoles: Enantiomeric Organocatalysts of Broad Utility in Organic Synthesis”. CHIMIA 61 (5):247. https://doi.org/10.2533/chimia.2007.247.