@article{DE_2006_42_2_a12,
     author = {D. P. Kostomarov},
     title = {Problems for an ultrahyperbolic equation in the half-space with the boundedness condition for the solution},
     journal = {Differencialʹnye uravneni\^a},
     pages = {245--251},
     year = {2006},
     volume = {42},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_2_a12/}
}