J.B., Swinnery, H.L., Vastano, J.A. (1985) Determining Lyapounov exponents from a time series. Physica 16D:285-317 Woyshville, M.J., Lackamp, J.M., Eisengart, J.A., Gilliland, J.A.M. (1999) On the meaning and measurement of affective instability; clues from chaos theory. Bio. Psychiat. 45:261-269 Xu, J. (