MAGNETOCALORIC EFFECT AND CRITICAL PHENOMENA OF IRON, COBALT AND NICKEL NEAR THE CURIE TEMPERATURE W. ROCKER, R. KOHLHAAS and H. W. SCHÖPGENS J. Phys. Colloques, 32 C1 (1971) C1-652-C1-653 DOI: 10.1051/jphyscol:19711225