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Naumann, Christoph and Langhals, Heinz (1990): Synthese von 1,7-Diazaperylen. In: Chemische Berichte, Vol. 123, No. 9: pp. 1881-1884
Naumann, Christoph and Langhals, Heinz (1990): A Simple Synthesis of Dihydroxybipyridyls. In: Synthesis, Vol. 123: pp. 407-409