@article{DE_1986_22_5_a16,
     author = {Ya. Sh. Salimov},
     title = {Riesz means of biorthogonal expansions in eigen- and associated functions of nonselfadjoint extensions of the {Laplace} operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {864--876},
     publisher = {mathdoc},
     volume = {22},
     number = {5},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_5_a16/}
}