1. A. Fleming, Penicillin. Its Practical Application, 2nd ed., Buterworth, London, 1950.
2. E.H. Flynn (Ed.), Penicillins and Cephalosporins, Academic press, New York, 1972.
3. D.B. Boyd, in: R.B. Morin, M. Gorman (Eds.), Chemistry and Biology of β-lactam Antibiotics, vols. 1–3, Academic Press, New York, 1982.
4. R.B. Woodward, in: H.T. Clarke, J. Johnson, R. Robinson (Eds.), The Chemistry of Penicillins, Princetown University Press, Princetown, 1949.
5. Nocardicin A and B, monocyclic .beta.-lactam antibiotics from a Nocardia species