BOND IMPURITY EFFECT IN THE LOW-DIMENSIONAL MAGNETIC SYSTEM (CH3)3 NHCoCl3.2H2O J.C. Schouten, K. Takeda et K. Kopinga J. Phys. Colloques, 39 C6 (1978) C6-723-C6-724 DOI: 10.1051/jphyscol:19786321