Abstract
A class of Bäcklund transformations recently introduced for four-dimensional space-time equations is shown to be limited to relating solutions of the sine-Gordon equation.
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Anderson, R.L., Barut, A.O., and R aczka, R., Lett. Math. Phys. 3, 351 (1979).
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Case, K.M. Bäcklund transformations in four-dimensional space-time. Lett Math Phys 4, 87–92 (1980). https://doi.org/10.1007/BF00417499
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DOI: https://doi.org/10.1007/BF00417499