1. 6β-Amidinopenicillanic Acids—a New Group of Antibiotics
2. in The Chemistry of Amidines and lmidates, edited by Chapt. 6. pp. 255-281 Wiley, New York (1975), and references cited therein.
3. and The Chemistry of Amidines and lmidates, edited by p. 96. Wiley New York (1975), and references cited therein.