Abdel-motaal, Marwa, et al. “Synthesis and Evaluation of Antioxidant Activity of Some New Heterocyclic Compounds Bearing the Benzo[B]Furan Moiety”. European Scientific Journal, ESJ, vol. 13, no. 30, Oct. 2017, p. 297, doi:10.19044/esj.2017.v13n30p297.