TY - JOUR AU - Ivan Yu. Polekhin TI - Some Results on the Existence of Forced Oscillations in Mechanical Systems JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 2020 SP - 267 EP - 279 VL - 310 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TM_2020_310_a18/ LA - ru ID - TM_2020_310_a18 ER -