3 citations to https://www.mathnet.ru/rus/faa1003
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Jürgen Pöschel, Progress in Mathematics, 169, European Congress of Mathematics, 1998, 167
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R S MacKay, S Aubry, “Proof of existence of breathers for time-reversible or Hamiltonian networks of weakly coupled oscillators”, Nonlinearity, 7:6 (1994), 1623
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C. Eugene Wayne, “Periodic and quasi-periodic solutions of nonlinear wave equations via KAM theory”, Commun.Math. Phys., 127:3 (1990), 479