1. Duffing Dust: Poincare Sections of Chaos  
   Patri Forwalter-Friedman, Harvey Mudd College, Claremont, CA  
2. Duffing's equation: catastrophic jumps of amplitude and phase  
   E. Christopher Zeeman, Hertford College, Oxford, England, United Kingdom  
3. Duffingsche Oszillator  
   Bernard Metsch, Institut für Theoretische Kernphysik, der Universität Bonn, Germany  
4. Duffing Oscillator Study  
   John Cozen, Physics Dept., George Mason University, Fairfax, VA  
5. Duffing's Mechanical Oscillator  
   J. D. Jones, M. Casco Associates  
6. Duffing Template  
   Nicholas B. Tufillaro, Los Alamos National Lab, University of California  
7. The Nonlinear Lab: Double Well Oscillator  
   Blair Fraser, Math. Dept., Univ. of Western Ontario, North London, Ontario, Canada  
8. Nonlinear Motion ... Duffing Oscillator  
   WebPhysics project, Physics Dept., Minnesota State University Moorhead, MN  
9. A Chaotic Oscillator  
   Rob de Boer, Dept. of Theoretical Biology, Utrecht University, The Netherlands
10. Duffing equation  
    David Jefferies, Electronic Engineering Dept., University of Surrey, Guildford, Surrey, UK  
11. Duffing equation  
    Robert W. Brown, Physics Dept., Case Western Reserve Univ., Cleveland, OH  
12. Chaotic Sources ... Duffing equation  
    Stanford Exploration Project, Geophysics Department, Stanford Univ., CA  
13. Numerical Solution of the Fokker-Planck Equation ... Duffing oscillator  
    Dragan Mirkovic, Computer Science Dept., University of Houston, TX  
14. Phase Plane (Second Order Equation) Duffing Oscillator  
    Reza Malek-Madani, Math. Dept., U.S. Naval Academy, Annapolis, MD  
15. Controlling Chaos of the Duffing's Equation  
    Tetsushi Ueta, Dept. of Information Science and Intelligent Systems, The University of Tokushima, Japan  
16. Unforced Duffing Equation  
    Ralph Byers, Math. Dept., University of Kansas, Lawrence, KS  
17. Duffing Equation applet  
    Pete Kernan, Physics Dept., Case Western Reserve University, Cleveland. OH  
18. Duffing's Equation applet  
    Dr Nigel R O'Brian, Math. and Statistics Dept., University of Sydney, Australia   
19. Nonlinear Dynamics ... Duffing applet  
    Joachim Holzfuss, Institute of Applied Physics, TU Darmstadt, Germany  

(c) John H. Mathews 2003