@article{TMF_1974_21_3_a11,
     author = {A. F. Lubchenko and V. M. Nitsovich and N. V. Tkach},
     title = {Dispersion of the permittivity tensor of ionic crystals in the exciton region},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {415--423},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1974_21_3_a11/}
}