Citation: Cernik, R. J.; Barwick, M.; Azough, F.; Freer, R. (2007). A synchrotron X-ray study of structural ordering in~the microwave dielectric ceramic system: Ba(Ni~1/3~Nb~2/3~)O~3~--Ba(Zn~1/3~Nb~2/3~)O~3~. Journal of Applied Crystallography, 40, pp. 749-755.