MAGNETIC ORDERING OF TWO-DIMENSIONAL ANTIFERROMAGNETIC FORMATES M. MATSUURA, H.W. J. BLÖTE, W. J. HUISKAMP, K. TAKEDA et T. HASEDA J. Phys. Colloques, 32 C1 (1971) C1-757-C1-758 DOI: 10.1051/jphyscol:19711263