%0 Journal Article %A G. G. Petrosyan %T Antiperiodic boundary value problem for a semilinear differential equation of fractional order %J The Bulletin of Irkutsk State University. Series Mathematics %D 2020 %P 51-66 %V 34 %I mathdoc %U http://geodesic.mathdoc.fr/item/IIGUM_2020_34_a3/ %G en %F IIGUM_2020_34_a3