1. Ephrati-Elizur, E. (1965). Biochem. Biophys. Res. Comm. 18, 103
2. Gale, E.F., Cundliffe, E., Reynolds, P.E., Richmond, M.H. and Waring, M.J. (1972). The Molecular Basis of Antibiotic Action, Wiley and Sons, London.
3. Garcia, E. (1974) Thesis Fac. Sci. Madrid.
4. Joenje, H., Gruber, M. and Venema, G. (1972) Biochem. Biophys. Acta 262, 189
5. López, R., Garcia, E., Espinosa, M., Pérez Urena, M.T. and Porto-lés, A. (1974). Progress in chemoth. I, p. 144. Daikos, Ed.