1. Changes in penicillinase-producing Neisseria gonorrhoeae isolated in London;Ison, C.A.; Easmon, C.S.F.;J MedMicrobiol,1989
2. World-wide development of antibiotic resistance in pneumococci. Eur j Clin Microbiol;Appelbaum, P.C.,1987
3. Is pneumococcal infection a preventable disease?;Finch, R.G.;J Inject,1988
4. Penicillin-resistant strains of Neisseria meningitidis in Spain;Saez-Nieto, J.A.; Campos, J.;Lancet,1988
5. Penicillin-resistant Neisseria meningitidis in Southern Africa;Botha, P.;Lancet,1988