@article{DAN_1967_176_3_a21,
     author = {P. V. Klevtsov and L. Yu. Kharchenko and R. F. Klevtsova},
     title = {The hydrothermal synthesis and symmetry of oxytungstate crystals $\mathrm{Ln}_2\mathrm{W}_2\mathrm{O}_9$ 
},
     journal = {Doklady Akademii Nauk},
     pages = {575--577},
     publisher = {mathdoc},
     volume = {176},
     number = {3},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_176_3_a21/}
}