@article{DAN_1989_308_3_a3,
     author = {N. N. Tarkhanov},
     title = {A criterion for the solvability of the ill-posed {Cauchy} problem},
     journal = {Doklady Akademii Nauk},
     pages = {531--534},
     publisher = {mathdoc},
     volume = {308},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_308_3_a3/}
}