@article{DAN_1977_233_3_a9,
     author = {L. P. Nizhnik and V. G. Tarasov},
     title = {The inverse nonstationary scattering problem for a hyperbolic system of equations},
     journal = {Doklady Akademii Nauk},
     pages = {300--303},
     publisher = {mathdoc},
     volume = {233},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_233_3_a9/}
}