Griffiths phases in the strongly disordered Kondo necklace model T. G. Rappoport, A. Saguia, B. Boechat and M. A. Continentino Europhys. Lett., 61 6 (2003) 831-837 Published online: 01 March 2003 DOI: 10.1209/epl/i2003-00309-6