Summary
Beginning with the usual Lagrangian for the string theory, we find new intermediate solutions for the field equations. Those solutions are also independent of the explicit form of the initial Lagrangian.
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References
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Léauté, B., Marcilhacy, G. & Melliti, T. Invariant solutions for the four Nambu-Goto field equations. Nuov Cim B 108, 1191–1196 (1993). https://doi.org/10.1007/BF02827315
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DOI: https://doi.org/10.1007/BF02827315