1. A. Kleeman, W. Leuthtenberger, B. Hoppe, and H. Tanner,Ullmann’s Encyclopedia of Industrial Chemistry, Vol. A2, p. 55, VO, Weinhein (1985).
2. T. Kaneko, Y. Izumi, I. Chibata, and T. Itoh,Synthetic Production and Utilization of Amino Acids, Chap. 4, Halsworth Press, New York (1974).
3. J. P. Greenstein and M. Winitz,Chemistry of the Amino Acids, Vol. 3, p. 1901, John Wiley, New York (1961).
4. Synthesis of l-cysteic acid by indirect electrooxidation and an example of paired synthesis: L-cysteic and l-cysteine from l-cystine