@article{VMP_2011_12_3_a1,
     author = {A. V. Goncharsky and S. Yu. Romanov},
     title = {On a problem of ultrasonic tomography},
     journal = {Numerical methods and programming},
     pages = {317--320},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMP_2011_12_3_a1/}
}