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Science (New York, N.Y.)|January 6, 1978
Pierce's disease of grapevines: isolation of the causal bacteriumM J Davis, A H Purcell, S V Thomson
Journal of Hepatology|January 1, 1991
Biological and molecular comparisons of human (HM-175) and simian (AGM-27) hepatitis A virusesS U Emerson, S A Tsarev, R H Purcell
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