@article{MMO_1952_1_a7,
     author = {B. M. Levitan},
     title = {Remark on a theorem of {V.\,A.~Marchenko}},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {421--422},
     publisher = {mathdoc},
     volume = {1},
     year = {1952},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1952_1_a7/}
}