@article{DAN_1991_319_4_a16,
     author = {V. I. Gryn'},
     title = {Joint reconstruction of the absorption coefficient and the source
},
     journal = {Doklady Akademii Nauk},
     pages = {849--853},
     publisher = {mathdoc},
     volume = {319},
     number = {4},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_319_4_a16/}
}