@article{DAN_1973_211_5_a19,
     author = {V. G. Romanov},
     title = {A one-dimensional inverse problem for the wave equation},
     journal = {Doklady Akademii Nauk},
     pages = {1083--1084},
     publisher = {mathdoc},
     volume = {211},
     number = {5},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_211_5_a19/}
}