S. Thomas and M. Harikumaran Nair, “Synthesis and Spectral Studies of Some Novel Oxovanadium(IV) Complexes of 2,3-Dimethyl-1-Phenyl-4-(2-hydroxy-5-chlorophenylazo)pyrazol-5-one”, ajc, vol. 17, no. 4, pp. 2657–2662, Jun. 2016.