@article{DE_2002_38_5_a9,
     author = {Ar. B. Bazarbekov and Ak. B. Bazarbekov},
     title = {The {Goursat} and {Darboux} {Problems} for the {Three-Dimensional} {Wave} {Equation}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {660--665},
     publisher = {mathdoc},
     volume = {38},
     number = {5},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2002_38_5_a9/}
}