@article{DE_1985_21_12_a25,
     author = {A. S. Rudnitskii and A. D. Titov and A. P. Khapalyuk},
     title = {A boundary value problem for the wave equation in a tetrahedral domain},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2181--2184},
     publisher = {mathdoc},
     volume = {21},
     number = {12},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_12_a25/}
}