D. Sofiane, A. O. Adil, B. Tahar, and A. D. Eddine, “Synthesis and Antimicrobial Activity of 4-S-Methyl-1,3,4-Oxadiazole Derivatives of Some Natural Amino Acids Bearing Secondary Quaternary Ammonium Salt Moieties”, Orbital: Electron. J. Chem., vol. 10, no. 7, pp. 482-488, Dec. 2018.