@article{ZNSL_2008_354_a2,
     author = {A. S. Blagoveshchenskii and D. A. Fedorenko},
     title = {The inverse problem for the acoustic equation in a~weakly horizontally inhomogeneous medium},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {81--99},
     publisher = {mathdoc},
     volume = {354},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2008_354_a2/}
}