Comment on "Capturing correlations in chaotic diffusion by approximation   methods"
  This is a comment on [G. Knight and R. Klages, Phys. Rev. E 84, 041135 (2011); also available at arXiv:1107.5293v2 [math-ph]]. 
Thomas Gilbert, David P. Sanders
cond-mat.stat-mech math-ph math.MP nlin.CD