A. Sheat, M., and O. I. Mohammed. “Synthesis of 1,3,4-Oxadiazole Derivatives from Ethyl-2-Piperidone-3-Carboxylate”. Journal of Education and Science (JES) 25, no. 1 (March 1, 2012): 19–25. Accessed August 6, 2025. https://ojs.uomosul.edu.iq/index.php/edusj/article/view/23683.