%0 Journal Article %A È. M. Muhamadiev %A A. N. Naimov %T Criteria for the existence of periodic and bounded solutions of three-dimensional systems of differential equations %J Trudy Instituta matematiki i mehaniki %D 2021 %P 157-172 %V 27 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/TIMM_2021_27_1_a15/ %G ru %F TIMM_2021_27_1_a15