Geodesic
On the Eigenvalue Distribution and a Bessel Property Criterion for Root Functions of a Differential Operator: I
Differencialʹnye uravneniâ, Tome 41 (2005) no. 4, pp. 464-478 
V. M. Kurbanov. On the Eigenvalue Distribution and a Bessel Property Criterion for Root Functions of a Differential Operator: I. Differencialʹnye uravneniâ, Tome 41 (2005) no. 4, pp. 464-478. http://geodesic.mathdoc.fr/item/DE_2005_41_4_a3/
@article{DE_2005_41_4_a3,
     author = {V. M. Kurbanov},
     title = {On the {Eigenvalue} {Distribution} and a {Bessel} {Property} {Criterion} for {Root} {Functions} of a {Differential} {Operator:} {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {464--478},
     year = {2005},
     volume = {41},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2005_41_4_a3/}
}
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