1. 
   Limit Cycle
   A periodic cycle in a dynamical system such that previous states are returned to repeatedly.
   Found op http://mitpress.mit.edu/books/FLAOH/cbnhtml/glossary.html
   
   
2. 
   Limit-cycle
   In mathematics, in the area of dynamical systems, a limit-cycle on a plane or a two-dimensional manifold is a closed trajectory in phase space having the property that at least one other trajectory spirals into it either as time approaches infinity or as time approaches negative infinity. Such beha...
   Found op http://en.wikipedia.org/wiki/Limit-cycle
   
   

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