Kantz, H. Max Planck Institute for the Physics of Complex Systems, Max Planck Society;
Kantz, H., Radons, G., & Yang, H. L. (2013). The problem of spurious Lyapunov exponents in time series analysis and its solution by covariant Lyapunov vectors. Journal of Physics A-Mathematical and Theoretical, 46(25): 254009. doi:10.1088/1751-8113/46/25/254009.