singh, Lakshman, and Ms. Upma Singh. 2010. “Synthesis and Charcterization of Oxoyanadium(IV) Coordination Compounds Derived from 4[N-(4-Hydroxy-3-Methyl Benzalidene) Amino] Antipyrine Semicarbazone and 4[N-(3,4,5-Trimethoxybenzalidene) Amino] Antipyrine Semicarbazone&Dagger”;. Asian Journal of Chemistry 13 (4):1427-34. https://asianpubs.org/index.php/ajchem/article/view/22820.