R. Gilmore, Jean Marc Ginoux, Timothy Jones, C. Letellier, and U. S. Freitas, Connecting curves for dynamical systems, J. Phys. A: Math. Theor., 43(25), 255101 (2010).
R. Gilmore, Chaos and Attractors, Encylcopedia of Mathematical Physics (J.P. Antoine,G. L. Naber, and S. T. Tsou, eds.), Amsterdam: Elsevier, 477-488 (2006).