Van Heeswijk, W. A. R.; Eenink, M. J. D.; Feijen, J.
An Improved Method for the Preparation of γ-Esters of Glutamic Acid and β-Esters of Aspartic Acid
Synthesis; Issue 9; 1982; 744-747.
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http://www.thieme-connect.com/ejournals/toc/synthesis/1718