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1). Song XM, Sayari A, Sulfated zirconia-based strong solid-acid catalysts: Recent progress , CATALYSIS REVIEWS-SCIENCE AND ENGINEERING 38 (3): 329-412 1996

2). Xu BQ, Sachtler WMH, Reduction of SO4= ions in sulfated zirconia catalysts , JOURNAL OF CATALYSIS 167 (1): 224-233 APR 1 1997

3). Wang X, Xie YC , CH4 deep oxidation over active and thermally stable catalysts based on Sn-Cr composite oxide , NEW JOURNAL OF CHEMISTRY 25 (12): 1621-1626 2001
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