1. V. S. Asatiani, Biochemical Analysis [in Russian], Part I, Tbilisi (1949), p. 212.
2. S. D. Balakhovskii and I. S. Balakhovskii, Methods of Chemical Analysis of Blood [in Russian], Moscow (1953), p. 286.
3. M. Nocheva, Probl. Endokrinol., No. 3, 20 (1970).
4. I. V. Sidorenkov, Vopr. Med. Khimii, No. 5, 535 (1967).
5. S. W. Barker and W. H. Summerson, J. Biol. Chem.,138, 535 (1941).