1. and Maleic anhydride, maleic acid and fumaric acid, in Kirk-Othmer Encyclopedia of Chemical Technology, 3rd edn, Ed by and J Wiley & Sons, New York. Vol 14, pp 770-788 (1978).
2. and Aspartic acid, in Comprehensive Biotechnology: The Principles, Applications and Regulations of Biotechnology in Industry, Agriculture and Medicine, Ed by Pergamon Press Ltd, Oxford. Vol 3, pp 633-640 (1985).