Ravindranath, L.K., K. Srikanth, and D. Ishrath Begum. 2010. “Microwave-Assisted Synthesis of 1,3,4-Oxadiazoles Containing Pyrazolones”. Asian Journal of Chemistry 23 (3):1020-22. https://asianpubs.org/index.php/ajchem/article/view/16098.