Dokl. Akad. Nauk SSSR, 1974 Volume 217, Number 3,Pages 569–572(Mi dan38442)
CRYSTALLOGRAPHY
Deciphering of crystalline structure of
$\mathrm{Na}_{11}\mathrm{Nb}_2\mathrm{Ti}[\mathrm{Si}_2\mathrm{O}_7]_2
[\mathrm{PO}_4]_2\mathrm{O}_3\mathrm{F}$ by the method of vector subsystems