1. Z. Naturforsch. 60b, (2005) p. 967
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http://www.znaturforsch.com/ab/v60b/c60b.htmPalladium-Catalyzed Coupling Reaction of 3-Bromo Benzofuran, -thiophene and -selenophene 2-Carboxaldehyde. Preparation of Tetracyclic Heteroaromatic Derivatives
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