References
P. C. Sabatier:Lett. Nuovo Cimento,26, 477 (1979).
International Meeting on Nonlinear Evolution Equations and Dynamical Systems, June 20–23, 1979, Lecce (Italy).
F. Calogero: private communication
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Sabatier, P.C. On some spectral problems and isospectral evolutions connected with the classical string problem. Lett. Nuovo Cimento 26, 483–486 (1979). https://doi.org/10.1007/BF02750261
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DOI: https://doi.org/10.1007/BF02750261