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Hans-G. Biedermann, Wolfgang Graf, Erika Griessl, Klaus Wichmann. "Notizen: Kupfer(II)komplexe mit Polypyridyläthylenen / Metal Complexes with Polymeric Ligands, VI1 Copper(II)Complexes with Polypyridylethylenes." Zeitschrift für Naturforschung. B, A journal of chemical sciences 29.3-4 (1974) 267-268