Electronic structure and magnetic coupling properties of Gd-doped AlN: first-principles calculationsY. J. Zhang, H.-L. Shi, S. X. Wang, P. Zhang and R. W. LiEur. Phys. J. B, 77 3 (2010) 345-349DOI: https://doi.org/10.1140/epjb/e2010-00273-4