SRIVASTAVA, K.P., and NIRMAL KUMAR OJHA. 2010. “Synthesis and Structural Characterization of Transition Metal(II) Complexes With Monobasic Tetradentate (NOOS Donor) Ligand”. Asian Journal of Chemistry 19 (1):385-90. https://asianpubs.org/index.php/ajchem/article/view/20450.