CALORIMETRIC EVIDENCE OF STRUCTURAL AND FERROMAGNETIC TRANSITIONS I N GdxEr1-xRh4B4 J.C. Ho, C.Y. Huang et J.L. Smith J. Phys. Colloques, 39 C6 (1978) C6-381-C6-382 DOI: 10.1051/jphyscol:19786170