@article{DAN_1977_236_2_a13,
     author = {V. N. Strakhov},
     title = {On the equivalence in the inverse problem of gravimetry at variable mass density},
     journal = {Doklady Akademii Nauk},
     pages = {329--331},
     publisher = {mathdoc},
     volume = {236},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_236_2_a13/}
}