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- 2. NRW-HIV-Symposium am 15. November 1997 in Bonn . 1997, A/97 Sonderheft, [Supl.] - Berlin : Robert Koch-Institut , 1997 - 30 s. (Infektionsepidemiologische Forschug; [Supl.]) [1, currently available 0, at library only 1]
- Chapters, articles