Critical Point of a Symmetric Vertex Model
  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. 
Kouji Ueda, Ryota Otani, Yukinobu Nishio, Andrej Gendiar, and   Tomotoshi Nishino