@article{DAN_1957_116_6_a21,
     author = {A. N. Khlapova},
     title = {New data on the polymorphism of sodium carbonate},
     journal = {Doklady Akademii Nauk},
     pages = {979--982},
     publisher = {mathdoc},
     volume = {116},
     number = {6},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_116_6_a21/}
}