Ashok, D., et al. “A Novel Method for Synthesis and Their Antimicrobial Activity of 1H-Tetrazole Based Flavones and Flavanone Derivatives under Ultrasonic and Microwave Irradiation Methods”. Asian Journal of Chemistry, vol. 31, no. 7, June 2019, pp. 1495-00, doi:10.14233/ajchem.2019.21925.