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Spectral Functions in Mathematics and Physics, 2001
Miki Wadati, “Introduction to solitons”, Pramana - J Phys, 57:5-6 (2001), 841
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E. L. Velasquez, Hamiltonian Systems with Three or More Degrees of Freedom, 1999, 625
Yongtang Wu, Mengru Li, “Some Trace Formulas for the Eigenvalue Problem of Schrödinger System”, J. Phys. Soc. Jpn., 68:4 (1999), 1107
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