@article{DE_2004_40_1_a1,
     author = {A. I. Vagabov and V. S. Galyaev},
     title = {On the {Completeness} of {Root} {Functions} of {Pencils} of {Linear} {Ordinary} {Differential} {Operators} with {General} {Boundary} {Conditions}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {5--14},
     publisher = {mathdoc},
     volume = {40},
     number = {1},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2004_40_1_a1/}
}