@article{IVM_1966_4_a6,
     author = {V. I. Zhukovskii},
     title = {On the conditional stability in the critical case of a~double zero root},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {53--57},
     year = {1966},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1966_4_a6/}
}