@article{DE_1974_10_7_a1,
     author = {B. I. Anan'ev},
     title = {The duality of the problems of optimal observation and control for linear systems with lag},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1160--1167},
     publisher = {mathdoc},
     volume = {10},
     number = {7},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_7_a1/}
}