@article{DE_1996_32_3_a4,
     author = {N. B. Kerimov},
     title = {On the basis property and uniform minimality of systems of root functions of differential {operators.~I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {317--322},
     publisher = {mathdoc},
     volume = {32},
     number = {3},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1996_32_3_a4/}
}