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A periodic boundary value problem for the sine-Gordon equation, small Hamiltonian perturbations of it, and KAM-deformations of finite-gap tori. (English. Russian original) Zbl 0791.35118

St. Petersbg. Math. J. 4, No. 3, 439-468 (1993); translation from Algebra Anal. 4, No. 3, 42-78 (1992).
MSC:  35Q53 37J99 35B35
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