1. Bergan, T. Penicillins. Antibiot. Chemother. 25 (1978) 1–122.
2. Ferrero, E.: Methode pour l'étude de la résistance des penicillines à la degradation produite par la flore intestinale. In:Spitzy, K. H., Haschek, H. (eds.): Proceedings 5th International Congress of Chemotherapy vol. I/1. Wien. Med. Akad. 1967, p. 201–205.
3. Franchi, R., Perraro, F. Studio dell'assorbimento e dell'eliminazione di un nuovo antibiotico a largo spettro (metampicillina). Att. Accad. Med. Lomb. 22 (1967) 543–553.
4. Rolinson, G. M., Sutherland, R. Semisynthetic penicillins. Adv. Pharmacol. Chemother. 11 (1973) 151–200.
5. Sjöberg, B., Ekström, B., Forsgren, U. α-Azidobenzylpenicillin I. Chemistry, bacteriology and experimental chemotherapy. Antimicrob. Agents Chemother. 1967 (1968) 560–567.