@article{DE_1973_9_2_a8,
     author = {V. A. Sadovnichii},
     title = {A uniqueness theorem for the solution of the inverse problem of spectral analysis in the case of a differential equation with periodic boundary conditions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {271--277},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_2_a8/}
}