@article{DE_1987_23_5_a18,
     author = {N. V. Tsyvis and N. J. Yurchuk},
     title = {A three-point problem for third-order operator-differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {877--881},
     publisher = {mathdoc},
     volume = {23},
     number = {5},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_5_a18/}
}