@article{VTAMU_2018_23_124_a10,
     author = {A. I. Perov and I. D. Kostrub},
     title = {Signs of regularity and stability of differential equations of higher order},
     journal = {Vestnik rossijskih universitetov. Matematika},
     pages = {674--678},
     year = {2018},
     volume = {23},
     number = {124},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTAMU_2018_23_124_a10/}
}