@article{VSGTU_2001_12_a4,
     author = {E. A. Utkina},
     title = {On a three-dimensional {Goursat} problem},
     journal = {Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences},
     pages = {30--35},
     publisher = {mathdoc},
     number = {12},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGTU_2001_12_a4/}
}