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<H1><A NAME="SECTION00080000000000000000">References</A></H1>
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<LI> Bak P. and M. Creutz. Fractals and self-organized criticality. In: Fractals in Science. Bunde A. and S. Havlin, eds. New York: Springer-Verlag, 1994:27-47.
<LI> Beck R.J., T.P. Andriacchi, K.N. Kuo, R.W. Fermier and J.O. Galante. Changes in the gait patterns of growing children. <I>J Bone Joint Surg [Am] </I> 63: 1452-1457, 1981.
<LI> Blin O., A.M. Ferrandez, J. Pailhous and G. Serratrice. Dopa-sensitive and dopa-resistant gait parameters in Parkinson's disease. <I>J Neurol Sci </I> 103: 51-54, 1991.
<LI> Blin O., A.M. Ferrandez and G. Serratrice. Quantitative analysis of gait in Parkinson patients: increased variability of stride length. <I>J Neurol Sci </I> 98: 91-97, 1990.
<LI> Breniere Y. and B. Bril. Why do children walk when falling down while adults fall down in walking? <I>C R Acad Sci III </I> 307: 617-622, 1988.
<LI> Forssberg H., B. Johnels and G. Steg. Is parkinsonian gait caused by a regression to an immature walking pattern? <I>Adv Neurol </I> 40: 375-379, 1984.
<LI> Hausdorff J.M., M.E. Cudkowicz, R. Firtion, J.Y. Wei and A.L. Goldberger. Gait variability and basal ganglia disorders: stride-to-stride variations in gait cycle timing in Parkinson's and Huntington's disease. <I>Mov Disord </I> 13: 428-437, 1998.
<LI> Hausdorff J.M., H.E. Edelberg, S.L. Mitchell, A.L. Goldberger and J.Y. Wei. Increased gait unsteadiness in community dwelling elderly fallers. <I>Arch Phys Med Rehab </I> 78: 278-283, 1997.
<LI> Hausdorff J.M., Z. Ladin and J.Y. Wei. Footswitch system for measurement of the temporal parameters of gait. <I>J Biomech </I> 28: 347-351, 1995.
<LI> Hausdorff J.M., S.L. Mitchell, R. Firtion, et al. Altered fractal dynamics of gait: reduced stride interval correlations with aging and Huntington's disease. <I>J Appl Physiol </I> 82: 262-269, 1997.
<LI> Hausdorff J.M., C.-K. Peng, Z. Ladin, J.Y. Wei and A.L. Goldberger. Is walking a random walk? Evidence for long-range correlations in the stride interval of human gait. <I>J Appl Physiol </I> 78: 349-358, 1995.
<LI> Hausdorff J.M., P.L. Purdon, C.-K. Peng, et al. Fractal dynamics of human gait: stability of long-range correlation in stride interval fluctuations. <I>J Appl Physiol </I> 80: 1448-1457, 1996.
<LI> Kelso J.A.S. and B. Tuller. A dynamical basis for action systems. In: Handbook of Cognitive Science. M.S. Gazanniga, ed. New York: Plenum Press, 1984:321-356.
<LI> Miller R.A., M.H. Thaut, G.C. McIntosh and R.R. Rice. Components of EMG symmetry and variability in parkinsonian and healthy elderly gait. <I>Electroencephalogr Clin Neurophysiol </I> 101: 1-7, 1996.
<LI> Myklebust B.M. A review of myotatic reflexes and the development of motor control and gait in infants and children: a special communication. <I>Phys Ther </I> 70: 188-203, 1990.
<LI> Pailhous J. and M. Bonnard. Steady-state fluctuations of human walking. <I>Behav Brain Res </I> 47: 181-190, 1992.
<LI> Peng C.-K., S.V. Buldyrev, A.L. Goldberger, et al. Finite size effects on long-range correlations: implications for analyzing DNA sequences. <I>Phys Rev E </I> 47: 3730-3733, 1993.
<LI> Peng C.-K., S. Havlin, H.E. Stanley and A.L. Goldberger. Quantification of scaling exponents and crossover phenomena in nonstationary heartbeat time series. <I>Chaos </I> 6: 82-87, 1995.
<LI> Preis S., A. Klemms and K. Muller. Gait analysis by measuring ground reaction forces in children: changes to an adaptive gait pattern between the ages of one and five years. <I>Dev Med Child Neurol </I> 39: 228-233, 1997.
<LI> Press W.H., B.P. Flannery, S.A. Teukolsky and W.T. Vetterling. Numerical Recipes. Cambridge, England: Cambridge University Press, 1987:381-453.
<LI> Rose-Jacobs R. Development of gait at slow, free, and fast speeds in 3- and 5-year- old children. <I>Phys Ther </I> 63: 1251-1259, 1983.
<LI> Schoner G. and J.A.S. Kelso. Dynamic pattern generation in behavioral and neural systems. <I>Science </I> 239: 1513-1520, 1988.
<LI> Shumway-Cook A. and M.H. Woollacott. Motor Control: Theory and Practical Applications. Baltimore, MD: Williams and Wilkins, 1995.
<LI> Slaton D.S. Gait cycle duration in 3-year-old children. <I>Phys Ther </I> 65: 17-21, 1985.
<LI> Sutherland D.H., R. Olshen, L. Cooper and S.L. Woo. The development of mature gait. <I>J Bone Joint Surg [Am] </I> 62: 336-353, 1980.
<LI> Sutherland D.H., R.A. Olshen, E.N. Biden and M.P. Wyatt. The Development of Mature Walking. Oxford: MacKeith Press, 1988.
<LI> Thelen E., J.A.S. Kelso and A. Fogel. Self-organizing systems and infant motor development. <I>Mov Disord </I> 428-437, 1987.
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