Local control of area-preserving maps
  We present a method of control of chaos in area-preserving maps. This method gives an explicit expression of a control term which is added to a given area-preserving map. The resulting controlled map which is a small and suitable modification of the original map, is again area-preserving and has an invariant curve whose equation is explicitly known. 
Cristel Chandre (CPT), Michel Vittot (CPT), Guido Ciraolo (M2P2)