A boundary inverse problem for a second order differential operator
2014 ◽
Vol 5
(2)
◽
pp. 24-30
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 ◽
2016 ◽