%0 Journal Article %A D. Schenk %A M. A. Shubin %T Asymptotic expansion of the state density and the spectral function of a~Hill operator %J Sbornik. Mathematics %D 1987 %P 473-490 %V 56 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1987_56_2_a11/ %G en %F SM_1987_56_2_a11