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Olsen, S. F., B. Djurhuus, K. Rasmussen, H. D. Joensen, S. O. Larsen, H. Zoffman, und I. Lind. Pharyngeal Carriage of Neisseria Meningitidis and Neisseria Lactamica in Households With Infants Within Areas With High and Low Incidences of Meningococcal Disease. Cambridge University Press, 1991.

Olsen, S. F., et al. Pharyngeal Carriage of Neisseria Meningitidis and Neisseria Lactamica in Households With Infants Within Areas With High and Low Incidences of Meningococcal Disease. Cambridge University Press, 1991.