HPLC analysis of harringtonine and homoharringtonine in the needles of Cephalotaxus griffithii alkaloid fraction and cytotoxic activity on chronic myelogenous leukaemia K562 cell - Moirangthem, D S; Borah, J C; Laishram, S; Kalita, M C; Talukdar, N C (Nat Prod Res, 2014)