Optical and dielectric relaxator behaviour of Ba('Zr IND. 0.25''Ti IND. 0.75')'O IND.3' ceramic explained by means of distorted clusters - Badapanda, T.; Rout, S. K.; Cavalcante, L. S.; Sczancoski, J. C.; Panigrahi, S.; Longo, E.; Siu Li, Máximo (Journal of Physics D, 2009)