Citation: Roberts, M. A.; Fitch, A. N. (1991). The crystal-structures of Ag~4~Ge~7~O~16~·6D~2~O and Na~3~(ND~4~)Ge~7~O~16~·6D~2~O refined from high-resolution synchrotron radiation and neutron powder diffraction data. Journal of Physics and Chemistry of Solids, 52, pp. 1209-1218.