1. Barker, S. A. (1978). In: Topics in Enzyme and Fermentation Biotechnology, Vol. 2. Ed. Wiseman, A. Horwood/ Wiley, pp. 120–51.
2. Mosbach, K., Danielsson, B. et al. (1975). Biochem. Biophys. Acta, 403, 256–65.
3. Lowe, C. R. (1979). FEBS Lett., 106, 405–8.
4. Marks, V., Bridges, J. W. et al. (1970). Brit. P. 1 549069 (assigned to Carlo Erba, Milan).
5. Wiseman, A. (1978). In: Developments in Food Analysis Techniques, Vol I. Ed. King, R. D. Applied Science Publishers, London, 179–95.