Magnetic and exchange studies in amorphous Co80-xHoxB20 alloys O. El Marrakechi, A. Kaal, S. Sayouri, M. Tlemçani and H. Lassri Eur. Phys. J. B, 34 4 (2003) 467-471 Published online: 09 September 2003 DOI: 10.1140/epjb/e2003-00245-9