WANG, ZHOUYU, and ZHENJU JIANG. 2010. “Recent Advances in Enantioselective Organocatalytic Reductionof C=N Bonds With Hantzsch Esters As the Hydride Source”. Asian Journal of Chemistry 22 (6):4141-49. https://asianpubs.org/index.php/ajchem/article/view/16726.