1. Interactions between impurities and nonlinear waves in a driven nonlinear pendulum chain
   Chen, W.; Hu, B.; Zhang, H.
   Physical Review, 2002, vol. 65, no. 13, pp. 134302, Ingenta.  
2. Robust Nonlinear H2/H∞ Control for a Parallel Inverted Pendulum with Dry Friction
   Han, S. I.; Kim, J. S.; Choi, J. W.
   JSME International Journal Series C, 2002, vol. 45, no. 1, pp. 194-203, Ingenta.  
3. Effect of Nonlinear Stiffness on the Motion of a Flexible Pendulum
   Zaki, K.; Noah, S.; Rajagopal, K. R.; Srinivasa, A. R.
   Nonlinear Dynamics, 2002, vol. 27, no. 1, pp. 1-18, Ingenta.  
4. One nonlinear differential equation and operation of hydraulic dissipative pendulum.
   Dorovsky, V. N.
   Comput. Math. Appl. 41 (2001), no. 5-6, 697--702, Math. Sci. Net.  
5. Nonlinear swing up control of inverted pendulum via Lyapunov function approach. (Japanese)
   Higashi, Kenichi; Suemitsu, Haruo; Matsuo, Takami
   Rep. Fac. Engrg. Oita Univ. No. 44 (2001), 79--86, Math. Sci. Net.  
6. Distinguishing Periodic and Chaotic Time Series Obtained from an Experimental Nonlinear Pendulum
   Franca, L. F. P.; Savi, M. A.
   Nonlinear Dynamics, 2001, vol. 26, no. 3, pp. 253-271, Ingenta.  
7. Nonlinear behaviour in a torsion pendulum
   Milotti, E.
   European Journal of Physics, 2001, vol. 22, no. 3, pp. 239-248, Ingenta.  
8. Nonlinear Dynamics of a Harmonically-Excited Inelastic Inverted Pendulum
   Williamson, E. B.; Hjelmstad, K. D.
   Journal of Engineering Mechanics, 2001, vol. 127, no. 1, pp. 52-57, Ingenta.  
9. An analysis of a nonlinear pendulum-type equation arising in smectic C liquid crystals  
   Barclay, G. J.; Stewart, I. W.
   J. Phys. A 33 (2000), no. 25, 4599--4609, Math. Sci. Net.  
10. On the Range of Certain Pendulum-Type Equations
    Petr Girg, Francisco Roca  
    Journal of Mathematical Analysis and Applications, Vol. 249, No. 2, (2000), pp. 445-462, Math. Sci. Net.  
11. Robust Controller for Nonlinear & Unstable System: Inverted Pendulum
    Mirza, A.; Hussain, S.
    Advances in Modelling and Analysis, 2000, vol. 55, no. 3/4, pp. 49 I-60 I, Ingenta.  
12. Predictive Control of Nonlinear Mechanical Systems Using a Short-Term Prediction Method Based on Chaos Theory: Applications to a Forced Pendulum
    Masumoto, N.; Yamakawa, H.
    Asme, 2000, vol. 61, pp. 165-172, Ingenta.  
13. Nonlinear Ordinary Boundary Value Problems under a Combined Effect of Periodic and Attractive Nonlinearities
    A. Cañada
    Journal of Mathematical Analysis and Applications, Vol. 243, No. 1, Mar 2000, pp. 174-189, Ideal.  
14. Experimental study of Chaos in a driven triple pendulum  
    Q. Zhu, M. Ishitobi  
    Journal of Sound and Vibration, Vol. 227, No. 1, Oct 1999, pp. 230-238, Ideal.  
15. Branches of Forced Oscillations for Periodically Perturbed Second Order Autonomous ODEs on Manifolds
    Massimo Furi, Marco Spadini
    Journal of Differential Equations, Vol. 154, No. 1, May 1999, pp. 96-106, Ideal.  
16. The Inverted Pendulum: A Singularity Theory Approach
    H. W. Broer, I. Hoveijn, M. van Noort, G. Vegter
    Journal of Differential Equations, Vol. 157, No. 1, Sep 1999, pp. 120-149, Ideal.  
17. A remark on random perturbations of the nonlinear pendulum  
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    Ann. Appl. Probab. 9 (1999), no. 3, 611--628, Math. Sci. Net.  
18. Control of the oscillation of a pendulum with limited torque---an application of human simulated intelligent control to a nonlinear system. (Chinese)
    Li, Zu Shu
    Control Theory Appl. 16 (1999), no. 2, 225--229, Math. Sci. Net.  
19. Nonlinear generalize equations of motion for multi-link inverted pendulum systems.
    Eltohamy, Khalad Gamel; Kuo, Chen-Yuan
    International journal of systems science, 1999, vol. 30, no. 5, pp. 505, Ingenta.  
20. Controlling Chaos Using Nonlinear Approximations for a Pendulum with Feedforward and Feedback Control.
    Yagasaki, K.; Yamashita, S.
    International journal of bifurcation and chaos in applied sciences and engineering, 1999, vol. 9, no. 1, pp. 233, Ingenta.  
21. Nonlinear optimal control of a triple link inverted pendulum with single control input.
    Eltohamy, Khaled Gamal; Kuo, Chen-Yuan
    Internat. J. Control 69 (1998), no. 2, 239--256, Math. Sci. Net.  
22. Sensitive dependence on initial conditions of strongly nonlinear periodic orbits of the forced pendulum.
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23. Nonlinear optimal control of a triple link inverted pendulum with single control input.
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    International journal of control, 1998, vol. 69, no. 2, pp. 239, Ingenta.  
24. Gudermann and the Simple Pendulum  
    John S. Robertson  
    College Math Journal: Volume 28, Number 4, (1997), Pages: 292-295.
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27. On the Stability of Periodic Solutions of the Damped Pendulum Equation
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28. Nonlinear dynamics of a sinusoidally driven pendulum in a repulsive magnetic field.
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    American journal of physics, 1997, vol. 65, no. 5, pp. 393, Ingenta.  
29. Probabilistic analysis of a nonlinear pendulum  
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30. Investigation of nonlinear oscillations of a compound pendulum.
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31. The Geometrical Description of the Nonlinear Dynamics of a Multiple Pendulum  
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    SIAM Journal on Applied Mathematics, Vol. 55, No. 6. (Dec., 1995), pp. 1753-1763, Jstor.  
32. Geometry and the Foucault Pendulum  
    John Oprea  
    American Mathematical Monthly, Vol. 102, No. 6. (Jun. - Jul., 1995), pp. 515-522, Jstor.  
33. Stabilization of the Inverted Linearized Pendulum by High Frequency Vibrations  
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    SIAM Review, Vol. 37, No. 2. (Jun., 1995), pp. 219-223, Jstor.  
34. Nonlinear control of a swinging pendulum.
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36. Teaching the Nonlinear Pendulum  
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40. Renormalizing the Simple Pendulum (in Classroom Notes)  
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41. Chaotic Motion of a Pendulum with Oscillatory Forcing  
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    American Mathematical Monthly, Vol. 100, No. 6. (Jun. - Jul., 1993), pp. 563-572, Jstor.  
42. Bifurcation of positive solutions of generalized nonlinear undamped pendulum problems.
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47. Stability of the Inverted Pendulum--A Topological Explanation (in Classroom Notes)  
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48. The forced pendulum: a paradigm for nonlinear analysis and dynamical systems.
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49. Power Series Solution to a Simple Pendulum with Oscillating Support  
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50. Pendulum in a Variable Medium: Problem 85-5 (in Problems)  
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51. Experiments on the bifurcation behaviour of a forced nonlinear pendulum
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52. Problem 83-14: Pendulum with Variable Length (in Problems)  
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53. The elastic pendulum: a nonlinear paradigm.
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57. Galileo on the Isochrony of the Pendulum  
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58. Effect of Vibration on the Accuracy of a Vertical Reference Pendulum  
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59. The Asymptotic Behavior of Solutions of Pendulum-Type Equations  
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60. Limiting Sets of Trajectories of a Pendulum-Type System  
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61. Contour Integration in the Theory of the Spherical Pendulum and the Heavy Symmetrical Top  
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62. The Spherical Pendulum and Complex Integration  
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63. The Generalized Double Pendulum  
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64. Lagrange's Compound Pendulum  
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65. Foucault's Pendulum in Elliptic Space  
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66. A Note on Foucault's Pendulum  
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67. On Foucault's Pendulum  
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68. The Deflecting Force of the Earth's Rotation and Foucault's Pendulum: An Elementary Analysis  
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69. On Foucault's Pendulum  
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70. A Pendulum Whose Time of Oscillation Is Independent of the Position of Its Centre of Gravity  
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(c) John H. Mathews 2003