Codes and Noncommutative Stochastic Matrices
  Given a matrix over a skew field fixing the column (1,...,1)^t, we give formulas for a row vector fixed by this matrix. The same techniques are applied to give noncommutative extensions of probabilistic properties of codes. 
Sylvain Lavall\'ee, Christophe Reutenauer, Vladimir Retakh, Dominique   Perrin