%0 Journal Article %A I. Yu. Kolpakov %T On the solvability of the periodic boundary-value problem for a first-order differential equation unsolved with respect to the derivative %J Itogi nauki i tehniki. Sovremennaâ matematika i eë priloženiâ. Tematičeskie obzory %D 2017 %P 50-52 %V 132 %I mathdoc %U http://geodesic.mathdoc.fr/item/INTO_2017_132_a10/ %G ru %F INTO_2017_132_a10