%0 Journal Article %T Silica tungstic acid (STA) as a highly efficient and reusable catalyst for the synthesis of benzoxanthenes under solvent-free conditions in ultrasonication %A Reddy, Avuthu %A Reddy, Mudumala %A Jeong, Yeon %J Research on Chemical Intermediates %V 42 %N 6 %P 5209-5218 %@ 0922-6168 %D 2015-11-16 %I Springer Netherlands %~ DeepDyve