H. Fan et al., FUSION PROCEDURE FOR THE Z(N) BELAVIN MODEL WITH OPEN BOUNDARY-CONDITIONS, Journal of physics. A, mathematical and general, 29(18), 1996, pp. 5735-5743
We have recently used unitarity and cross-unitarity properties of an Z
(n) symmetric R-matrix to construct the transfer matrix t(u) for an N-
site open spin chain. Here we give a fusion procedure for such a chain
, and we prove that the fused transfer matrix (t) over bar(u) is commu
tative with the original transfer matrix t(u).