Citation: Roberts, M.A.; Fitch, A.N. (1991). The crystal structures of Ag4 Ge7 O16 * 6(D2 O) and Na3 (N D4) Ge7 O16 * (D2 O) refined from high resolution synchrotron radiation and neutron powder diffraction data. Journal of Physics and Chemistry of Solids, 52, pp. 1209-1218.