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- [21] Fe3O4@Silica sulfuric acid core-shell composite as a novel nanomagnetic solid acid: synthesis, characterization and application as an efficient and reusable catalyst for one-pot synthesis of 3,4-dihydropyrimidinones/thiones under solvent-free conditions RESEARCH ON CHEMICAL INTERMEDIATES, 2015, 41 (05) : 2991 - 3001