@article{DE_1982_18_12_a6,
     author = {M. L. Rasulov},
     title = {An expansion formula for a spectral problem with boundary conditions containing derivatives of higher order than the equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2149--2166},
     publisher = {mathdoc},
     volume = {18},
     number = {12},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1982_18_12_a6/}
}