Solitions in a Heisenberg Spin Chain with an Impurity

The thermodynamics of the anisotropic Heisenberg chain with boundary spin impurities

Non-Fermi-liquid behavior of impurity spins in the anisotropic Heisenberg chain

Properties of magnetic impurities embedded into an anisotropic Heisenberg chain with spin gap

Bethe ansatz for an open Heisenberg spin chain with impurity

On anisotropic one-dimensional Heisenberg chain with impurities

Heisenberg chain with impurities (an integrable model)