S. Esmailzadeh and D. Setamdideh, “Synthesis and characterization of Fe3O4/PEG-400/oxalic acid magnetic nanoparticles as a heterogeneous catalyst for the synthesis of pyrrolin-2-ones derivatives: Scientific paper”, J. Serb. Chem. Soc., vol. 86, no. 11, pp. 1039–1052, Nov. 2021.