@article{DAN_1978_240_4_a3,
     author = {V. M. Isakov},
     title = {On the existence of solutions of inverse problems of potential theory},
     journal = {Doklady Akademii Nauk},
     pages = {771--773},
     publisher = {mathdoc},
     volume = {240},
     number = {4},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_240_4_a3/}
}