@article{ZNSL_2023_521_a5,
     author = {M. N. Demchenko},
     title = {Existence of a solution to the scattering problem for the ultrahyperbolic equation},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {79--94},
     publisher = {mathdoc},
     volume = {521},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2023_521_a5/}
}