Uysal, U. (2012) “A Semi-Empirical and Density Functional Theory Study of 2,2’,3,4-Tetrahydroxy-3’- sulpho Azobenzene Derivatives and Their Zirconium Complexes”, Asian Journal of Chemistry, 25(5), pp. 2783–2791. doi: 10.14233/ajchem.2013.13903.