@article{DAN_1982_265_1_a15,
     author = {L. P. Otroshchenko and V. I. Simonov and N. V. Belov},
     title = {Refinement of crystal structure of two $\mathrm{Mn}$-silicates $\mathrm{Na}_2\mathrm{Mn}_2\mathrm{Si}_2\mathrm{O}_7$ and 
},
     journal = {Doklady Akademii Nauk},
     pages = {76--79},
     publisher = {mathdoc},
     volume = {265},
     number = {1},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1982_265_1_a15/}
}