Geodesic
Real finite-gap regular solutions of the Kaup--Boussinesq equation
Teoretičeskaâ i matematičeskaâ fizika, Tome 66 (1986) no. 1, pp. 30-46

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Smooth real finite-gap solutions of the Kaup–Boussinesq equation are found together with simple reductions of the general smooth real two-gap and three-gap solutions to one-dimensional theta functions. The Abelian integrals that occur in the solutions are reduced to elliptic integrals. 
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     author = {A. O. Smirnov},
     title = {Real finite-gap regular solutions of the {Kaup--Boussinesq} equation},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {30--46},
     publisher = {mathdoc},
     volume = {66},
     number = {1},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1986_66_1_a2/}
}
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A. O. Smirnov. Real finite-gap regular solutions of the Kaup--Boussinesq equation. Teoretičeskaâ i matematičeskaâ fizika, Tome 66 (1986) no. 1, pp. 30-46. http://geodesic.mathdoc.fr/item/TMF_1986_66_1_a2/