@article{DE_1977_13_10_a20,
     author = {V. I. Bulatov},
     title = {Spectral controllability of systems with lag},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1876--1878},
     publisher = {mathdoc},
     volume = {13},
     number = {10},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_10_a20/}
}