@article{DAN_1960_132_4_a5,
     author = {V. F. Korop},
     title = {The converse problem of dispersion for equations with a singularity},
     journal = {Doklady Akademii Nauk},
     pages = {754--757},
     year = {1960},
     volume = {132},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_132_4_a5/}
}