1. Catino JJ, Francher DM, Edinger KJ, Stringfellow DA: A microtitre cytotoxicity assay useful for the discovery of fermentation-derived antitumor agents.Cancer Chemother. Pharmacol. 15:240–243, 1985.
2. Long BH, Stringfellow DA: Inhibitors of topoisomerase II: Structure-activity relationships and mechanism of action of podophyllin congeners. In: Advances in Enzyme Regulation, G Weber (ed), Pergamon press, New York, 1988, Vol. 27, pp. 223–256.
3. Rominson IB, Abelson HT, Housman DE, et al: Amplification of specific DNA sequences correlates with multi-drug resistance in Chinese hamster cells. Nature. 309:626–628, 1984.
4. Gerinn JH, Endicott JA, Juranka PF, et al: Homology between P-glycpprotein and a bacterial haemolysin transport protein suggests a model for multi-drug resistance. Nature 324:485–495, 1966.
5. Crosswell AR: Personal communication.