4) DARLAND, G. & J. BIRNBAUM: Cefoxitin resistance to beta-lactamase: A major factor for susceptibility of Bacteroides fragilis to the antibiotic. Antimicr.Agents & Chemoth. 11: 725-734, 1977
5) STAPLEY, E.O.; M. JACKSON, S. HERNANDEZ, S. B. ZIMMERMAN, S. A. CURRIE, S. MOCHALES, J. M.MATA, H. B. WOODRUFF & D. HENDLIN Cephamycins, a new family of β-lactam antibiotics. I. Production by actinomycetes, including Streptomyces lactamdurance sp. n. Antimicr. Agents & Chemoth. 2: 122-131, 1972