@article{DE_1987_23_8_a0,
     author = {\`E. I. Grudo},
     title = {The structure of the solutions of a periodic {Pfaffian} system with one zero root of the characteristic equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1291--1299},
     publisher = {mathdoc},
     volume = {23},
     number = {8},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_8_a0/}
}