Hoffmann, Matthias, and Dieter Seebach. “Synthesis of Non-Proteinogenic Amino-Acid Methyl Esters With Acid-Sensitive Side Chains from a Chiral Glycine Derivative”. CHIMIA 51, no. 3 (March 26, 1997): 90. Accessed November 23, 2024. https://www.chimia.ch/chimia/article/view/1997_090_2.