Title Covalently Bonded Ionic Liquid-Type Sulfamic Acid onto SBA-15: SBA-15/NHSO3H as a Highly Active, Reusable, and Selective Green Catalyst for Solvent-Free Synthesis of Polyhydroquinolines and Dihydropyridines Type JournalPaper Keywords Not Registered! Abstract Not Registered! Researchers (Second Researcher), Sadegh Rostamnia (First Researcher)