Abdelhamid, Abdou Osman, et al. “Reactions With Hydrazonoyl Halides 65: Synthesis of Some New 1,3,4-Thiadiazoles and triazolino[4,3-a]pyrimidines Containing Pyrazole Moiety”. European Journal of Chemistry, vol. 2, no. 3, Sept. 2011, pp. 317-23, doi:10.5155/eurjchem.2.3.317-323.420.