Radini, Ibrahim Ali, et al. “Ecofriendly and Simple Synthesis of pyrano[3,2-c]quinolone in Water via an Efficient One-Pot Three-Component Reaction”. European Journal of Chemistry, vol. 9, no. 1, Mar. 2018, pp. 44-48, doi:10.5155/eurjchem.9.1.44-48.1679.