%0 Journal Article %A Nurlan S. Imanbaev %T Characteristic determinant of a perturbed regular third-order differential operator on an interval %J Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika %D 2025 %P 25-31 %V 18 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/JSFU_2025_18_1_a2/ %G en %F JSFU_2025_18_1_a2