Controlling chaos in area-preserving maps
  We describe a method of control of chaos that occurs in area-preserving maps. This method is based on small modifications of the original map by addition of a small control term. We apply this control technique to the standard map and to the tokamap. 
Cristel Chandre, Michel Vittot, Yves Elskens, Guido Ciraolo, Marco   Pettini