1. V. S. Asatiani, Enzymic Methods of Analysis [in Russian], Moscow (1969), p. 427.
2. G. I. Maisaya, Soobshch. Akad. Nauk Gruz. SSR, No. 3, 851 (1968).
3. E. V. Parina, in: Molecular Bases of Life Processes [in Russian], Kiev (1966), p. 13.
4. E. V. Parina, Age and Protein Metabolism [in Russian], Khar'kov (1967).
5. T. S. Paskhina, Quantitative Determination of Amino Acids with Paper Chromatography by the Method of Formation of Copper Derivatives of Amino Acids with Ninhydrin [in Russian], Moscow (1959).