%0 Journal Article %A A. P. Markeev %T On the stability of periodic trajectories of a~planar Birkhoff billiard %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 2016 %P 206-217 %V 295 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_2016_295_a11/ %G ru %F TM_2016_295_a11