@article{BGUMI_2021_1_a2,
     author = {B. S. Kalitin},
     title = {On some problems of instability in semi-dynamical systems},
     journal = {Journal of the Belarusian State University. Mathematics and Informatics},
     pages = {39--45},
     publisher = {mathdoc},
     volume = {1},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/BGUMI_2021_1_a2/}
}