1. Aggeba, M.M. Merzhanian, A.A. and Soboliov, E.M. (1985) Microbiologia (5) 830?832.
2. Castro, M. Elias, A (1978) Cuban J. Agric. Sci. 12, 67?72.
3. Contreras, O.R. (1979) 27 I.U.P.A.C. Congress, 27?31.
4. Contreras, O.R. Delgada, R. Fernandez, N.R. and Numez, N. (1982) Rev. Latinoamericana Microbiologia, 24 (3) 167.
5. Contreras, O.R. Boldyrev, A.A. Delgado, R. (1985) Biochem. Int. 11 (4) 433?440.