@article{DAN_1976_229_4_a15,
     author = {A. I. Kruglik},
     title = {Crystal structure of ferroelectric phase of
},
     journal = {Doklady Akademii Nauk},
     pages = {853--855},
     publisher = {mathdoc},
     volume = {229},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_229_4_a15/}
}