%0 Journal Article %A T. L. Surin %T On the structure of the matrix of coefficients of a regular Lappo–Danilevskiǐ system %J Differencialʹnye uravneniâ %D 1987 %P 842-848 %V 23 %N 5 %U http://geodesic.mathdoc.fr/item/DE_1987_23_5_a13/ %G ru %F DE_1987_23_5_a13