1. Hollo, J., Laszlo, E., Hoschke, A., Bende, P., Bolgar, P., Wieg, A., (1985),Process Biochem., 20, 79–85.
2. Hopkins, R.H. and Bird, R., (1954).Biochem. J, 56, p. 86–91.
3. Mukhopadhyay, A., Chakrobarty, S.K., and Bajpai, P.K., (1990),Biotechnol. Tech. 4, 121–126.
4. Rosendal, P., Nielsen, B.H. and Lange, N.K. (1979),Die Starke., 11, 368–372.
5. Sumner, J.B., and Somers, G.F., (1944),Laboratory experiments in Biological Chemistry, p.44–48, Academic Press, NY.