For citations:

Vatolkin M.Yu. Investigation of the dimension of the spectral projection of a self-adjoint second order quasidifferential operator. Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika. 2024;(7):47-62. (In Russ.) https://doi.org/10.26907/0021-3446-2024-7-47-62