TY - JOUR AU - A. Kh. Stash TI - On essential values of Sergeev's frequencies and exponents of oscillation for solutions of a third-order linear differential periodic equation JO - Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki PY - 2023 SP - 141 EP - 155 VL - 33 IS - 1 UR - http://geodesic.mathdoc.fr/item/VUU_2023_33_1_a9/ LA - ru ID - VUU_2023_33_1_a9 ER -