JOSEPH, JOJO, and B.H. MEHTA. 2010. “Spectral and Lattice Parameters of Transition Metal Complexes of Polydentate Schiff Bases Derived From3-Formyl 4-Hydroxy Coumarin and 4-Amino Phenol 2-Amino Benzoic Acid”. Asian Journal of Chemistry 19 (1):401-6. https://asianpubs.org/index.php/ajchem/article/view/20480.