@article{IVM_1986_8_a5,
     author = {B. S. Kalitin},
     title = {Nonasymptotic stability of invariant sets},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {31--34},
     year = {1986},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1986_8_a5/}
}