@article{ISU_2007_7_2_a2,
     author = {O. Yu. Dmitriev},
     title = {Expansions in eigenfunctions of the $n$-th order differential operator with non-regular boundary conditions},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {10--14},
     year = {2007},
     volume = {7},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2007_7_2_a2/}
}