Ferromagnetic behaviour in semiconductors: a new magnetism in search of spintronic materialsA. Quesada, M. A. García, J. de la Venta, E. Fernández Pinel, J. M. Merino and A. HernandoEur. Phys. J. B, 59 4 (2007) 457-461DOI: https://doi.org/10.1140/epjb/e2007-00063-1