Rai, B.K., and Pramod Choudhary. “Synthesis and Characterization of Transition Metal Complexes of 2-(p-Chlorophenyl)-4,5-Dimethyl (8H) Pyrimido [4,5-D] Pyrimidine Semicarbazone and Thiosemicarbazone ”. Asian Journal of Chemistry 14, no. 1 (March 30, 2010): 312–318. Accessed November 29, 2024. https://asianpubs.org/index.php/ajchem/article/view/22012.