%0 Journal Article %A V. I. Berdyshev %T An Object with a Striking Device and a Hostile Observer in Three-Dimensional Space %J Trudy Instituta matematiki i mehaniki %D 2021 %P 49-58 %V 27 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TIMM_2021_27_2_a3/ %G ru %F TIMM_2021_27_2_a3