@article{DE_1987_23_5_a13,
     author = {T. L. Surin},
     title = {On the structure of the matrix of coefficients of a regular {Lappo{\textendash}Danilevskiǐ} system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {842--848},
     year = {1987},
     volume = {23},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_5_a13/}
}