Veysipour S, Nasr-Esfahani M, Rafiee Z, Eftekhari Far B. Fe3O4@SiO2@IL‐PVP magnetic nanoparticles: Effective synthesis of spirooxindoles. Iran. J. Catal. 2024;11(2). Accessed July 29, 2026. https://oiccpress.com/ijc/article/view/3590