Sofiane, Daoudi, et al. “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: The Electronic Journal of Chemistry, vol. 10, no. 7, Dec. 2018, pp. 482-8, https://periodicos.ufms.br/index.php/orbital/article/view/16011.