@article{DAN_1987_297_3_a1,
     author = {M. I. Belishev},
     title = {An approach to multidimensional inverse problems for the wave},
     journal = {Doklady Akademii Nauk},
     pages = {524--527},
     year = {1987},
     volume = {297},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_297_3_a1/}
}