Detecting unstable periodic orbits in chaotic experimental data.

Paul So,1,2 Edward Ott,2,* Steven J. Schiff,1 Daniel T. Kaplan,3 Tim Sauer,4 and Celso Grebogi,2,† 1Department of Neurosurgery, Children’s National Medical Center and the George Washington University, NW, Washington, D.C. 20010 2Institute for Plasma Research, University of Maryland, College Park, Maryland 20742 3Center for Nonlinear Dynamics, McGill University, Montreal, Quebec, Canada H3G 1Y6 4Department of Mathematics, the George Mason University, Fairfax, Virginia 22030 (Received 8 December 1995)