@article{DAN_1992_327_3_a6,
     author = {Ya. V. Kurylev},
     title = {Admissible transformation groups which preserve boundary spectral data in multidimensional inverse problems},
     journal = {Doklady Akademii Nauk},
     pages = {322--325},
     publisher = {mathdoc},
     volume = {327},
     number = {3},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_327_3_a6/}
}