Nonstandard Bethe Ansatz equations for open O(N) spin chains

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D. Arnaudon, N. Crampe, A. Doikou, L. Frappat, and E. Ragoucy, “Analytical Bethe ansatz for open spin chains with soliton non preserving boundary conditions,” Int. J. Mod. Phys

2006

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T. Gombor and L. Palla, “Algebraic Bethe Ansatz for O(2N) sigma models with integrable diagonal boundaries,” JHEP

2016

Later among the works it cites.

A. Gerrard, N. MacKay, and V. Regelskis, “Nested algebraic Bethe ansatz for open spin chains with even twisted Yangian symmetry,” 2017

2017

Closest in time.