Geodesic
Real finite-zone solutions of the sine-Gordon equation: a formula for the topological charge
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 56 (2001) no. 5, pp. 980-981 
P. G. Grinevich; S. P. Novikov. Real finite-zone solutions of the sine-Gordon equation: a formula for the topological charge. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 56 (2001) no. 5, pp. 980-981. http://geodesic.mathdoc.fr/item/RM_2001_56_5_a5/
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}
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