R. Venkataramana, V. R. R. Chittireddy, D. Ashok, and K. K. Rao, “Microwave-assisted synthesis of 2,8-di(alkyl/aryl)-4,6-dichloro-2H,8H-pyrano[3,2-g]chromene-3,7-dicarbaldehydes and their antimicrobial activity”, J. Serb. Chem. Soc., vol. 84, no. 4, pp. 355–364, Apr. 2019.