Critical exponents and unusual properties of the broken phase in the 3d-RP2 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.
Nonuniversality in helical and canted-spin systems.
Vector-spin models with competing interactions have in general nontrivial ground states which completely break rotational invariance. We study the prototypical stacked triangular Heisenberg antiferromagnet by means of a O(3)×O(2)/O(2) nonlinear σ model in a 2+e expansion. We find a dynamically generated O(4) symmetry. We propose that such systems in three dimensions have a first-order transition or a second-order one with either N=4 or tricritical mean-field exponents. We argue that this view is supported by experimental and numerical data
Social Health Insurance Reforms—Mid-Term Experiences of Poland and Russia
As a result of transition process to market economy, Poland and Russia have come a long way from a centrally planned budget for social security to an insurance-type model in the social sphere. After more than two decades of reforms, it seems essential to compare and evaluate the policy solutions introduced in terms of the reform goals achieved and exposure to current challenges. The paper presents an analysis and comparison of social health insurance reforms conducted in Poland and Russia since the beginning of the 1990s. Moreover, the current problems of and future challenges for health care financing systems are identified. The varied experiences of Poland and Russia over more than 20 years show mid-term lessons which could be useful to other countries, especially those that face socio-economic transformation, in their choice of strategy and the practice of similar reforms.