"Synthesis of 4,4'-Arylmethylene-bis(3-methyl-5-pyrazolones) using Diammonium Hydrogen Phosphate as an Efficient and Versatile Catalyst in Aqueous Media"
Yang C.; Pang L.; Wang A.
Asian J. Chem., 2011, 23, 749-751.
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http://www.asianjournalofchemistry.co.in/user/journal/viewarticle.aspx?ArticleID=23_2_65