@article{DE_1987_23_5_a15,
     author = {S. I. Gaiduk},
     title = {Formulas for the expansion of given functions in eigenfunction series of a three-point boundary value problem with two parameters},
     journal = {Differencialʹnye uravneni\^a},
     pages = {852--867},
     publisher = {mathdoc},
     volume = {23},
     number = {5},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_5_a15/}
}