Bethe Ansatz methods developed by the author and Zotos almost 20 years ago
to examine TMMC established that it was not the hoped-for quantum sine-Gord
on system. Recent applications of these methods have shown that true quantu
m sine-Gordon systems have at last been found copper benzoate and Yb4As3. (
C) 2001 Elsevier Science B.V. All rights reserved.