Dokl. Akad. Nauk SSSR, 1982 Volume 267, Number 4,Pages 850–853(Mi dan45787)
CRYSTALLOGRAPHY
A new tetrahedral radical $[\mathrm{Ge}_5\mathrm{O}_{16}]$ in the structure of
$\mathrm{Na}_4\mathrm{Sn}_2[\mathrm{Ge}_5\mathrm{O}_{16}]\cdot\mathrm{H}_2\mathrm{O}$