Critical exponents and unusual properties of the broken phase in the   3d-RP(2) antiferromagnetic model
  We present the results of a Monte Carlo simulation of the antiferromagnetic RP(2) model in three dimensions. With finite-size scaling techniques we accurately measure the critical exponents and compare them with those of O(N) models. We are able to parameterize the corrections-to-scaling. The symmetry properties of the broken phase are also studied. 
H. G. Ballesteros, L. A. Fernandez, V. Martin-Mayor, A. Munoz Sudupe   (Universidad Complutense de Madrid)