%0 Journal Article %A A. E. Pasenchuk %T Invertibility and spectrum of the Riemann boundary value problem operator in a countably normed space of smooth functions on a circle %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 2023 %P 56-63 %N 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_2023_8_a5/ %G ru %F IVM_2023_8_a5