R. Pandey, M. Rani Kumari, and N. Kumar, “Mononuclear Dioxomolybdenum(VI) and Dioxotungsten(VI) Complexes with Di(1-Phenyl Tetrazoline)-5,5’-Disulphie”, ajc, vol. 7, no. 2, pp. 285–288, Jul. 2012.