Stationary Solutions in 2+1 Dimensional Gravity and Closed Time-Like   Curves
  We apply the reduced radial gauge to give the general solution of the metric in 2+1 dimensions in term of quadratures. It allows a complete controll on the support of the source. We use the result to prove that for a general stationary universe, conical at infinity, the weak energy condition and the absence of CTC at space infinity prevent the occurrrence of any CTC. 
P. Menotti and D. Seminara