%0 Journal Article %A V. N. Pavlenko %A A. A. Asryan %T Periodic solutions existence for a second order differential equation with a discontinuous nonlinearity %J Čelâbinskij fiziko-matematičeskij žurnal %D 2019 %P 323-332 %V 4 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/CHFMJ_2019_4_3_a4/ %G ru %F CHFMJ_2019_4_3_a4