Entanglement in the anisotropic Heisenberg XYZ model with different Dzyaloshinskii-Moriya interaction and inhomogeneous magnetic fieldD. C. Li and Z. L. CaoEur. Phys. J. D, 50 2 (2008) 207-214DOI: https://doi.org/10.1140/epjd/e2008-00208-x