1. Brotzu G. Richerche sudi un nuovo antibiotico. Lavori dellisto Digienen die Caligari. 1948; 1–11.
2. The structure of cephalosporin C;Abraham;Biochem. J.,1961
3. Cephalosporins;Smith,1985
4. Enzymes involved in penicillin, cephalosporin and cephamycin biosynthesis;Martin;Adv. Biochem. Eng. Biotechnol.,1989
5. New aspects of genes and enzymes for β-lactam antibiotic synthesis;Martin;Appl. Microbiol. Biotechnol.,1998