Antiviral activities of extracts isolated from Terminalis chebula Retz., Sanguisorba officinalis L., Rubus coreanus Miq. and Rheum palmatum L. against hepatitis B virus - Kim,T.G.; Kang,S.Y.; Jung,K.K.; Knag,J.H.; Lee,E.; Han,M.H. (Phytother Res, 2001)