@article{DE_1998_34_1_a3,
     author = {T. B. Kopeikina},
     title = {Relative observability of linear time-dependent singularly perturbed systems with delay},
     journal = {Differencialʹnye uravneni\^a},
     pages = {24--30},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_1_a3/}
}