@article{DE_1990_26_11_a23,
     author = {Yu. A. Vorohobko and A. L. Lebedev},
     title = {Duality in filtration problems and optimal control in case of incomplete information on the entry for systems with delay},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2002--2004},
     publisher = {mathdoc},
     volume = {26},
     number = {11},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_11_a23/}
}