@article{PFMT_2017_1_a8,
     author = {V. I. Mironenko and V. V. Mironenko},
     title = {T{\cyrn}{\cyre} linear systems perturbations, which do not change {Poincar\'e} mapping},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {54--58},
     publisher = {mathdoc},
     number = {1},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2017_1_a8/}
}