@article{DAN_1969_185_3_a14,
     author = {N. K. Bel'skii and D. A. Muhamedova},
     title = {Negative dispersion of light in the $\mathrm{CaWO}_4:\mathrm{Nd}^{3+}$ crystal},
     journal = {Doklady Akademii Nauk},
     pages = {545--547},
     publisher = {mathdoc},
     volume = {185},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_185_3_a14/}
}