1. Penicillinase-producing Neisseria gonorrhoeae strains from Nigeria with Far-Eastern-type plasmid;Anderson;Lancet,1982
2. Further spread of plasmids among different auxotypes of penicillinase-producing gonococci;Ansink-Schipper;Lancet,1982
3. Penicillinase-producing Neisseria gonorrhoeae;Ashford;Lancet,1976
4. Serogrouping and auxotyping for epidemiological study of beta-lactamase-producing Neisseria gonorrhoeae strains isolated in Sweden;Bygdeman;Acta Dermatovener. (Stockholm),1981
5. Gonococcal W serogroups in Scandinavia. A study with polyclonal and monoclonal antibodies;Bygdeman;Acta path, microbiol. immunol. scand. Sect. B,1983