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Recommendation of the Immunization Practices Advisory Committee (ACIP) Polysaccharide Vaccine for Prevention of Haemophilus influenzae Type b Disease. MMWR Weekly, 19.4.1985, 34. vsk, nro 15, s. 201–5. ISSN 0149-2195Artikkelin verkkoversio. Viitattu 3.10.2008.