@article{DAN_1986_291_2_a15,
     author = {A. A. Goncharenko and V. F. Kravchenko and V. I. Ponomarev},
     title = {The inverse scattering problem for wave beams in an inhomogeneous},
     journal = {Doklady Akademii Nauk},
     pages = {320--322},
     publisher = {mathdoc},
     volume = {291},
     number = {2},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_291_2_a15/}
}