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In http://www.he.sissa.it/~honecker/roc.html there is access to a program to compute the radius of compactification R describing the c=1 bosonic conformal theory which corresponds to the low-energy excitations of an XXZ-chain in a magnetic field.
cond-mat/9908398
,
cond-mat/9810263
,
cond-mat/9802035
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