1. Sanders, C., Nelsen, G., Sanders, E. Bacterial interference, II. Epidemiological determinants of the antagonistic activity of the normal throat flora against group A streptococci. Infection and Immunity 1977, 16: 599–603.
2. Grahn, E., Holm, S. E. Bacterial interference in the throat flora during a streptococcal tonsillitis outbreak in an apartment house area. Zentralblatt für Bakteriologie Mikrobiologie und Hygiene A 1983, 256: 72–79.
3. Roos, K., Grahn, E., Holm, S. E. Evaluations of beta-lactamase activity and microbial interference in treatment failures of acute streptococcal tonsillitis. Scandinavian Journal of Infectious Diseases 1986, 18: 313–319.
4. Grahn, E., Holm, S. S., Roos, K., Ekedahl, C. Interference of alpha-haemolytic streptococci isolated from tonsillar surface, on beta-haemolytic streptococci,Streptococcus pyogenes — a methodological study. Zentralblatt für Bakteriologie Mikrobiologie und Hygiene A 1983, 254: 459–468.