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S. Fulda, I. Jeremias, H. H. Steiner, T. Pietsch and K. M. Debatin, “Betulinic Acid: A New Cytotoxic Agent against Malignant Brain-Tumor Cells,” International Journal of Cancer, Vol. 82, No. 3, 1999, pp. 435-441.
doi:10.1002/(SICI)1097-0215(19990730)82:3<435::AID-IJC18>3.0.CO;2-1
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