Estimates for Root Functions of a Singular Second-Order Differential Operator
2020 ◽
Vol 5
(1)
◽
pp. 361-368
2020 ◽
Vol 1564
◽
pp. 012017
Basis property of a system of eigenfunctions of a second-order differential operator with involution
2019 ◽
Vol 29
(2)
◽
pp. 183-196
2006 ◽
Vol 6
(3)
◽
pp. 269-290
◽
2021 ◽