Shekhanavar, Raju, et al. “Fe3O4@C–SO3H Novel, Green and Recyclable Acid Catalysts for the Synthesis of 2-Amino-4H-Chromene Derivatives”. Iranian Journal of Catalysis, vol. 14, no. 3, Sept. 2024, pp. 1-16, https://doi.org/10.57647/j.ijc.2024.1403.22.