El-Rady, E. A., & El-Azab, I. H. (2012). Reactivity of β-enamino ester of benzo[f]chromene: One pot synthesis of isolated and heterocycle-fused derivatives of benzo[f] chromene. European Journal of Chemistry, 3(1), 81–86. https://doi.org/10.5155/eurjchem.3.1.81-86.507