@article{DAN_1990_312_3_a14,
     author = {A. S. Margulis},
     title = {Equivalence and uniqueness in an inverse problem of potential for},
     journal = {Doklady Akademii Nauk},
     pages = {577--580},
     publisher = {mathdoc},
     volume = {312},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_312_3_a14/}
}