Real-space renormalization group study of the anisotropic   antiferromagnetic Heisenberg model of spin S=1 on a honeycomb lattice
  The real-space RG approach is applied to study critical temperatures of system consisting of interacting spin chains of spin S=1 with an inner antiferromagnetic exchange which form a honeycomb crystal lattice. Using anisotropic Heisenberg model we calculate critical temperature as a function of anisotropic parameter and the ratio of interchain and intrachain interactions. A comparison our results with those obtained from RGRS calculations for the same model of spin-1/2 on a square lattice is given. 
A.S. Boyarchenkov, A.S. Ovchinnikov, I.G. Bostrem, N.V. Baranov, Y.   Hosokoshi, K. Inoue