J. JOSEPH and B. MEHTA, “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”, ajc, vol. 19, no. 1, pp. 401–406, Mar. 2010.