Sers of the bis (4,5-dimercapto-1,3-dithiole-2-thionato) nickelate (iii) / (ii)complex ion and of its inclusion compound in 'GAMA'-cyclodextrin adsorbed on a silver electrode - Barreto, W J; Santos, Paulo Sérgio; Rubim, Joel Camargo (Vibrational Spectroscopy, 1993)