THE USE OF RANDOM EXCHANGE HEISENBERG ANTIFERROMAGNETIC CHAINS FOR VERY LOW TEMPERATURE THERMOMETRY AND COOLING : QUINOLINIUM (TCNQ)2 W. G. Clark, L. C. Tippie, G. Frossati et H. GodfrinJ. Phys. Colloques, 39 C6 (1978) C6-1160-C6-1161DOI: https://doi.org/10.1051/jphyscol:19786513