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- [25] Preparation, Characterization and First Application of Alumina Supported Polyphosphoric Acid (PPA/Al2O3) as a Reusable Catalyst for the Synthesis of 14-Aryl-14H-dibenzo[a,j]xanthenes BULLETIN OF THE KOREAN CHEMICAL SOCIETY, 2011, 32 (07): : 2311 - 2315