@article{DE_1971_7_2_a7,
     author = {V. A. Pliss},
     title = {The structural stability of a sequence of linear systems of second order differential equations with periodic coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {261--270},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_2_a7/}
}