%0 Journal Article %A A. A. Gavryushkina %T The theory of Lists and $\Sigma$-definability %J The Bulletin of Irkutsk State University. Series Mathematics %D 2011 %P 27-38 %V 4 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/IIGUM_2011_4_4_a2/ %G ru %F IIGUM_2011_4_4_a2