THE PHASE DIAGRAM OF Rb2Mn0.7Mg0.3F4 IN A MAGNETIC FIELD R. A. Cowley, R. J. Birgeneau, T. Thurston and G. Shirane J. Phys. Colloques, 49 C8 (1988) C8-1221-C8-1222 DOI: 10.1051/jphyscol:19888553