@article{DAN_1991_316_3_a1,
     author = {S. S. Akhiev and S. N. Sanieva},
     title = {Problems of {Cauchy} and {Goursat} type on composite lines},
     journal = {Doklady Akademii Nauk},
     pages = {524--528},
     publisher = {mathdoc},
     volume = {316},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_316_3_a1/}
}