Neisseriae 1990: Proceedings of the Seventh International Pathogenic Neisseriae Conference, Berlin, Federal Republic of Germany, September 9–14, 1990. :741-746
Neisseriae 1990: Proceedings of the Seventh International Pathogenic Neisseriae Conference, Berlin, Federal Republic of Germany, September 9–14, 1990. :733-740
Neisseriae 1990: Proceedings of the Seventh International Pathogenic Neisseriae Conference, Berlin, Federal Republic of Germany, September 9–14, 1990. :721-726
Neisseriae 1990: Proceedings of the Seventh International Pathogenic Neisseriae Conference, Berlin, Federal Republic of Germany, September 9–14, 1990. :747-752
Neisseriae 1990: Proceedings of the Seventh International Pathogenic Neisseriae Conference, Berlin, Federal Republic of Germany, September 9–14, 1990. :671-678