Geodesic
Existence, singularity and multiplicity of solutions that correspond to superstructure~$C(2\times2)$ in non-ideal layer of adsorbate
Matematičeskoe modelirovanie, Tome 2 (1990) no. 1, pp. 126-143.

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The detailed research of $C(2\times2)$ corresponded solutions of nonlinear equations is done.The space of parameters is divided into regions of existence, singularity and multiplicity of such solutions. 
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     title = {Existence, singularity and multiplicity of solutions that correspond to superstructure~$C(2\times2)$ in non-ideal layer of adsorbate},
     journal = {Matemati\v{c}eskoe modelirovanie},
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G. G. Yelenin; Yu. V. Troshchiev. Existence, singularity and multiplicity of solutions that correspond to superstructure~$C(2\times2)$ in non-ideal layer of adsorbate. Matematičeskoe modelirovanie, Tome 2 (1990) no. 1, pp. 126-143. http://geodesic.mathdoc.fr/item/MM_1990_2_1_a11/