%0 Journal Article %A S. A. Vavilov %T A solvability criterion for a resonance periodic problem in the %J Doklady Akademii Nauk %D 1990 %P 787-790 %V 312 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1990_312_4_a2/ %G ru %F DAN_1990_312_4_a2