@article{DAN_1981_260_6_a16,
     author = {E. L. Belokoneva and N. V. Belov},
     title = {Crystal structure of synthetic $\mathrm{Ga},\mathrm{Ge}$-helenite, $\mathrm{Ca}_2\mathrm{Ga}_2\mathrm{GeO}_7=
},
     journal = {Doklady Akademii Nauk},
     pages = {1363--1366},
     publisher = {mathdoc},
     volume = {260},
     number = {6},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_260_6_a16/}
}