1)Hajipour, A. R.; Zarei, A.; Ruoho, A. E.; Supported Bismuth(III) Nitrate on Silica Sulfuric Acid as Useful Reagent for Nitration of Aromatic Compounds under Solvent-Free Conditions; Russian Journal of Organic Chemistry; English; 41; 10; 2005; 1493 - 1495;
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http://dx.doi.org/10.1007/s11178-005-0372-y