Artemisinin-Derived Sesquiterpene Lactones as Potential Antitumour Compounds: Cytotoxic Action against Bone Marrow and Tumour Cells - Beekman, Aäron C; Wierenga, Pieter K; Woerdenbag, Herman J; Uden, Wim Van; Pras, Niesko; Konings, Antonius W T; El-Feraly, Farouk S; Galal, Ahmed M; Wikström, Håkan V (Planta Medica, 1998)