Andotra, C.S., et al. “Synthesis and Biocidal Activity of Some 5-Thioxo-1,3,4-Oxadiazolo-[3,2-A]-S-Triazine-7-Ones”. Asian Journal of Chemistry, vol. 5, no. 2, Mar. 2010, pp. 370-4, https://asianpubs.org/index.php/ajchem/article/view/24820.