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Work partly supported by the Swiss National Science Foundation under Grant 2.002/0.86 and by the “Gruppo Nazionale per la Fisica Matematica” of the Italian Research Council (CNR). On leave from: Mathematics Department, University of Texas, Arlington, TX 76019, USA
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Vuillermot, PA. Quasiperiodic soliton solutions to nonlinear Klein-Gordon equations on ℝ2⋆. Math Z 203, 235–253 (1990). https://doi.org/10.1007/BF02570733
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DOI: https://doi.org/10.1007/BF02570733