1. Chaotic behaviour of multi-dimensional difference equations;Kaplan,1979
2. Dimension of Strange Attractors
3. L.S. Young, Dimension, entropy, and Lyapunov exponents, preprint.
4. P. Frederickson, J.L. Kaplan, E.D. Yorke and J.A. Yorke, J. Diff. Eq., to be published.