Improvement of magnetocaloric properties of Gd-Ge-Si alloys by alloying with iron J. Ferenc, M. Kowalczyk, G. Cieślak, T. Erenc-Sędziak and T. Kulik EPJ Web of Conferences, 40 (2013) 06005 Published online: 14 January 2013 DOI: 10.1051/epjconf/20134006005