%0 Journal Article %A N. A. Sidorov %A E. B. Blagodatskaya %T Differential equations with a Fredholm operator in the main %J Doklady Akademii Nauk %D 1991 %P 1087-1090 %V 319 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1991_319_5_a11/ %G ru %F DAN_1991_319_5_a11