A. S. Hussein, “Synthesis and Spectral studies of some (IIb) ions with 2 – [ ( 6 – Nitro – 2 – Benzothiazolyl ) azo – 4 , 5 – diphenyl imidazole and Their Biological Activity”, QJPS, vol. 22, no. 2, pp. 1-9, Jan. 2018.