We study a symmetric vertex model, that allows 10 vertex configurations, by use of the corner transfer matrix renormalization group (CTMRG), a variant of DMRG. The model has a critical point that belongs to the Ising universality class.
@article{arxiv.cond-mat/0501277,
title = {Critical Point of a Symmetric Vertex Model},
author = {Kouji Ueda and Ryota Otani and Yukinobu Nishio and Andrej Gendiar and Tomotoshi Nishino},
journal= {arXiv preprint arXiv:cond-mat/0501277},
year = {2010}
}