1. Cabib, G.; Silva, H.; Giulietti, A.M. and Ertola, R. 1983. J. Chem. Techn. Biotech., In press.
2. Cuervo, C.; Restrepo, L.; Bushman, D.H. and M. Rendon, 1972. C.A. Vol. 77, 46399 e.
3. Garrido (1973) XXVII Congreso Internacional de Química. Personal communication.
4. Farina, R.; Río, M.E. and Sanahuja, J.C. 1977, Nutrition Reports, 16, 293.
5. Forage, A.J.; Righelato, R.C. 1978. In: Progress Ind. Microbiol. M.J. Bull, ed. pp. 59?94.