@article{DAN_1968_180_3_a15,
     author = {S. V. Karpov and A. A. Shultin},
     title = {Infrared spectrum and lattice vibrations of a sodium nitrate crystal},
     journal = {Doklady Akademii Nauk},
     pages = {572--575},
     publisher = {mathdoc},
     volume = {180},
     number = {3},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_180_3_a15/}
}