@article{DE_1973_9_2_a0,
     author = {M. I. Alekseenko},
     title = {On the question of the unique solvability of a linear periodic boundary value problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {203--210},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_2_a0/}
}