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| Khalil, Behzad, Atashrazm, Aref and Rasoulian, Mona 2,4-Dioxo-1,3-diazaspiro[4,5]decane-3-sulfonic Acid as a Novel Solid Phase Halogen-free Acid Catalyst: Preparation, Characterization and Evaluation. S.Afr.j.chem. (Online), 2019, vol.72, p.195-200. ISSN 0379-4350
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