Geodesic
Two-gap elliptic solutions of the~Boussinesq equation
Sbornik. Mathematics, Tome 190 (1999) no. 5, pp. 763-781

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Two-gap solutions of the Boussinesq equation are considered. It is shown that for almost every Riemann surface $\Gamma$ of genus $g=2$ covering the elliptic surface it is possible to construct an elliptic (in $x$) two-gap solution of the Boussinesq equation. The existence of third- and fourth-order differential operators with elliptic “two-gap” potentials having an arbitrary number of poles is also established. An example is given. 
@article{SM_1999_190_5_a4,
     author = {A. O. Smirnov},
     title = {Two-gap elliptic solutions of {the~Boussinesq} equation},
     journal = {Sbornik. Mathematics},
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     number = {5},
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     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1999_190_5_a4/}
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A. O. Smirnov. Two-gap elliptic solutions of the~Boussinesq equation. Sbornik. Mathematics, Tome 190 (1999) no. 5, pp. 763-781. http://geodesic.mathdoc.fr/item/SM_1999_190_5_a4/