A. Kulshrestha, J. Pandey, and D. Panhekar, “Knoevenagel Condensation Shadowed by Michael Addition & O-Alkylation of Resorcinol, Malononitrile and Benzadehyde to form Pyrrolidine, Piperidine and Morpholine Substituted Benzopyran Derivatives in Dry K2CO3”, ajc, vol. 31, no. 7, pp. 1470–1472, Jun. 2019.