%0 Journal Article %A G. G. Yelenin %A Yu. V. Troshchiev %T Existence, singularity and multiplicity of solutions that correspond to superstructure~$C(2\times2)$ in non-ideal layer of adsorbate %J Matematičeskoe modelirovanie %D 1990 %P 126-143 %V 2 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM_1990_2_1_a11/ %G ru %F MM_1990_2_1_a11