1. Shah, P. M., Stille, W. Escherichia coli andKlebsiella pneumoniae strains more susceptible to cefoxitin than to third generation cephalosporins. J. Antimicrob. Chemother. 11 (1983) 597–601.
2. Bauernfeind, A., Shah, P., Petermüller, C., Motz, M.: Plasmid-determined resistance to third generation cephalosporins in Enterobacteria. Chemioterapia, Suppl. to no. 2 (1985) 30–31.
3. Hedges, R. W., Medeiros, A. A., Cohenford, M., Jacoby, G. A. Genetic and biochemical properties of AER-1, a novel carbenicillin-hydrolyzing β-lactamase fromAeromonas hydrophila. Antimicrob. Agents Chemother. 27 (1985) 479–484.
4. Simpson, I. N., Plested, S. J., Budin-Jones, M. J., Lees, J., Hedges, R. W., Jacoby, G. A. Characterisation of a novel plasmid-mediated β-lactamase and its contribution to β-lactam resistance inPseudomonas aeruginosa. FEMS Microbiology Letters 19 (1983) 23–27.
5. Matthew, M., Harris, A. M., Marshall, M. J., Ross, G. W. The use of analytical isoelectric focusing for detection and identification of β-lactamases. J. Gen. Microbiol. 88 (1975) 169–178.