@article{DE_1965_1_6_a5,
     author = {A. M. Kolobov},
     title = {On a periodic boundary value problem for a linear differential equation of the fourth order},
     journal = {Differencialʹnye uravneni\^a},
     pages = {758--763},
     publisher = {mathdoc},
     volume = {1},
     number = {6},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_6_a5/}
}