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T. M. Böhme, C. Keim, K. Kreutzmann, M. Linder, T. Dingermann, G. Dannhardt, E. Mutschler, G. Lambrecht: Structure-activity relationships of dimethindene derivatives as new M2-selective muscarinic receptor antagonists. In: Journal of medicinal chemistry. Band 46, Nummer 5, Februar 2003, S. 856–867, doi:10.1021/jm020895l, PMID 12593665.