1. Ansink-Schipper, M. C., Bygdeman, S.M., vanKlingerenB. and Sandström, S.G. (1988): Serovars, auxotypes, and plasmid profiles of PPNG strains with asian type plasmid isolated in Amsterdam. - Genitourin. Med., 64: 152?155.
2. Apicella, M.A. (1976): Serogrouping of Neisseria gonorrhoeae: Identification of four immunologically distinct acidic polysaccharides. - J. Infect. Dis. 134: 377?383.
3. Arko, R.J., Wong, K.H., Bullard, J.C. and Logan, L.C. (1976): Immunological and serological diversity of Neisseria gonorrhoeae: Immunotyping of gonococci by cross-protection in guinea pig subcutaneous chambers. - Infect. Immun. 14: 1293?1296.
4. Bäckmann, M., Ruden, A.-K.M., Bygdeman, S.M., FalkE.S., Jonsson, A., Kallings, I., Ringertz, O. and Sandström, E.G. (1987): Comparison between serological classification and auxotyping in the analysis of Neisseria gonorrhoeae infections. - Acta Path. Microbiol. Immunol. Scand. Sect. B 95: 181?188.
5. Bäckman, M., Ruden, A.-K.M., Bygdeman, S.M., Jonsson, A., Ringertz, O. and Sandström, E.G. (1985): Gonococcal serovar distribution in Stockholm, with special reference to multiple infections and infected partners. - Acta Path. Microbiol. Immunol. Scand. Sect. B 93: 225?232.