ADDENDUM: Addendum to 'Completeness of the Bethe Ansatz solution of the open XXZ chain with nondiagonal boundary terms'

We consider the integrable open XX quantum spin chain with non-diagonal boundary terms. We derive an exact inversion identity, by which we obtain the eigenvalues of the transfer matrix and the Bethe ansatz equations. For generic values of the boundary parameters, the Bethe ansatz solution is formulated in terms of the Jacobian elliptic functions.

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