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Schütze N, Vollmer G, Knuppen R (April 1994). "Catecholestrogens are agonists of estrogen receptor dependent gene expression in MCF-7 cells". J. Steroid Biochem. Mol. Biol. 48 (5–6): 453–61. doi:10.1016/0960-0760(94)90193-7. PMID8180106.