EPIDEMIOLOGY OF HBV-ASSOCIATED DELTA AGENT: GEOGRAPHICAL DISTRIBUTION OF ANTI-DELTA AND PREVALENCE IN POLYTRANSFUSED HBsAg CARRIERSMario Rizzetto, RobertH. Purcell, JohnL. Gerin|The Lancet|1980Cited by 236
INCIDENCE AND SIGNIFICANCE OF ANTIBODIES TO DELTA ANTIGEN IN HEPATITIS B VIRUS INFECTIONMario Rizzetto, DavidJ. Gocke, G Verme et al.|The Lancet|1979Cited by 185Open Access