Levinson, N. (1949): A second order differential equation with singular solutions.. Ann. Math. 50:127-153 Li, T.Y., Yorke, J.A. (1975): Period three implies chaos. Amer. Math. Mon. 82:985- 992 Liebovitch, L.S. (1989) Analysis of fractal ion channel gating kinetics: kinetic rates, energy levels, and activation energies. Math Biosci. 93:97-115 Liebovitch, L.S. (1998) Fractals and Chaos; Simplified for the Life Sciences. Oxford University Press, Oxford. Liebovitch,L.S., Sullivan, J.M. (1987) Fractal analysis of a voltage-dependent potassium channel from cultured mouse hippocampal neurons. Biophys J. 52:979- 88 Liebovitch, L.S., Todorov, A.T. Using fractals and nonlinear dynamics to determine the physical properties of ion channel proteins. (1996) Crit Rev Neurobiol 10:169-87 Liebovitch, L.S., Todorov, A.T. (1996) Invited editorial. J. Appl. Physiol. 80:1446- 1447 Liebert, W., Pawelzik, K., Schuster, H.G. (1991) Optimal embeddings of chaotic attractors from topological considerations. Europhys. Lett. 14:521-526 Lorenz, E.N. (1963): Deterministic nonperiodic flow. J. Atmos. Sci. 20:130-141 Lowen, S.B.,Teich, M.C.(1992) Auditory-nerve action potentials form a nonrenewal point process over short as well as long time scales. J Acoust Soc Am 92:803-6 270 HOUSE_OVERSIGHT_013770