@article{IVM_1975_5_a12,
     author = {G. S. Yudaev},
     title = {The conditional stability of countable systems of differential equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {87--92},
     year = {1975},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1975_5_a12/}
}