Double-well Oscillator:

 

http://www.apmaths.uwo.ca/~bfraser/chaos/doublewell/

      Theory and Simulations

 

http://www.enseeiht.fr/hmf/travaux/CD9900/travaux/optmfn/hi/00pa/mfn05/hydro.htm

      Theory

 

http://kong.apmaths.uwo.ca/~bfraser/version1/dwintro.html

      Theory and Simulations