@article{ZNSL_1999_257_a16,
     author = {V. N. Troyan and G. A. Ryzhikov},
     title = {Reqularization problems in three-dimensional ray tomography},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {298--303},
     publisher = {mathdoc},
     volume = {257},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1999_257_a16/}
}