%0 Journal Article %T ROLE OF NORWALK VIRUS IN TWO FOODBORNE OUTBREAKS OF GASTROENTERITIS: DEFINITIVE VIRUS ASSOCIATION %A FLEISSNER, MARY LOU %A HERRMANN, JOHN E. %A BOOTH, JEFFREY W. %A BLACKLOW, NEIL R. %A NOWAK, NANCY A. %J American Journal of Epidemiology %V 129 %N 1 %P 165-172 %@ 0002-9262 %D 1989-01-01 %I Oxford University Press %~ DeepDyve