Citation: Yamnova, N. Y.; Pushcharovsky, D. Y.; Andrianov, V. I.; Rastsvetaeva, R. K.; Khomyakov, A. P.; Mikheeva, M. G. (1989). A new type of silicon-oxygen group in the structure of grumantite Na[Si2O4(OH)]*H2O. Soviet Physics Doklady, 34, pp. 284-286.