Ranga, B.V., and S.S. Sangapure. 2010. “Synthesis of Some Bis-(1,3,4-Oxadiazol-2-Yl) Methanes of Biological and Pharamacological Interest ”. Asian Journal of Chemistry 9 (4):663-65. https://asianpubs.org/index.php/ajchem/article/view/23943.