Purba, W., P. Roy, S. Jannat, S. Begum, and M. Rahman. “Microwave-Assisted Urea Catalyzed Knoevenagel Condensation of Aldehydes With Active Methylene Compounds”. Bangladesh Journal of Scientific and Industrial Research, vol. 55, no. 2, June 2020, pp. 159-64, doi:10.3329/bjsir.v55i2.47637.