Kumara Swamy, Udutha, et al. “One-Pot Synthesis of Novel 3,5-Disubstituted-1,2,4-Oxadiazoles from Indazole Carboxylic Acid Esters and Amidoximes”. Asian Journal of Chemistry, vol. 26, no. 7, Mar. 2014, pp. 1921-30, doi:10.14233/ajchem.2014.15564.