@article{DAN_1976_231_1_a22,
     author = {M. A. Simonov and N. V. Belov},
     title = {On crystal structures of bertrandite $\mathrm{Be}_4[\mathrm{Si}_2\mathrm{O}_7](\mathrm{OH})_2$, and hemomorphite (calamine), $\mathrm{Zn}_4[\mathrm{Si}_2\mathrm{O}_7](\mathrm{OH})_2\cdot\mathrm{H}_2\mathrm{O}$},
     journal = {Doklady Akademii Nauk},
     pages = {97--99},
     publisher = {mathdoc},
     volume = {231},
     number = {1},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_231_1_a22/}
}