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eep Ch, K. N. Venugopala2, R. Venugopala3, and B. Odhav2, “Silica-Sulfuric Acid: Novel, Simple, Efficient and Reusable Catalyst for Hydration of Nitrile to Amide”, ajc, vol. 28, no. 10, pp. 2177–2180, Jun. 2016.