@article{IM2_1974_8_2_a7,
     author = {V. M. Borok},
     title = {Uniqueness classes for the solution of {Goursat's} problem},
     journal = {Izvestiya. Mathematics},
     pages = {423--435},
     year = {1974},
     volume = {8},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1974_8_2_a7/}
}