@article{DE_1990_26_12_a18,
     author = {Yu. A. Vorohobko and A. L. Lebedev},
     title = {On the solution of problems of ideal observation in time-dependent systems with retarded argument},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2165--2167},
     publisher = {mathdoc},
     volume = {26},
     number = {12},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_12_a18/}
}