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A.C. Garade, V.S. Kshirsagar and C.V. Rode
Selective hydroxyalkylation of phenol to bisphenol F over dodecatungstophosphoric acid (DTP) impregnated on fumed silica
Applied Catalysis A: General. - 2009. - Vol. 354, Issues 1-2. - P. 176-182
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http://dx.doi.org/10.1016/j.apcata.2008.11.025