@article{IVM_1977_2_a5,
     author = {L. E. Zabello},
     title = {On the question of the controllability of nonstationary {systems.~II}},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {27--36},
     publisher = {mathdoc},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1977_2_a5/}
}