1. Z. A. Ahmed, F. M. Arta, M. A. Abd Alla, M. E. Abd El-Monem and S. A. Metwally
An electronic spectral study of the coupled effect on the tautomeric equilibria of some a-hydroxy azo compounds
Spectrochimica Acta Part A: Molecular Spectroscopy
Volume 45, Issue 7, 1989, Pages 699-703
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http://dx.doi.org/10.1016/0584-8539(89)80254-52. J. A. Arancibia, A. C. OlivieriCorresponding and G. M. Escandar
Cu(II), Ni(II) and Co(II) co-ordination properties and tautomerism of 1,8-bis-phenylazo-2,7-dihydroxy naphthalene. A spectroscopic and semiempirical AM1/PM3 study
Journal of Molecular Structure
Volume 522, Issues 1-3, 2000, Pages 233-242
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http://dx.doi.org/10.1016/S0022-2860(99)00371-3