Active-to-absorbing phase transition subjected to the velocity   fluctuations in the frozen limit case
  The directed bond percolation process is studied in the presence of com- pressible velocity fluctuations with long-range correlations. We discuss a construction of a field theoretic action and a way of obtaining its large scale properties using the perturbative renormalization group. The most interest- ing results for the frozen velocity limit are given. 
N. V. Antonov, M. Hnatich, A. S. Kapustin, T. Lu\v{c}ivjansk\'y, L.   Mi\v{z}i\v{s}in
cond-mat.stat-mech