2Davad Applebaum. Levy Processes and Stochastic Calculus[M]. Lon- don:Cambridge University Press, 2004.
3P.Gopikrishnan, V.Plerou, L.A.N.Amaral, M.Meyer, H.E.Stanley. Scal- ing of the Distribution of Fluctuations of Financial Market Indices[J]. American Physical Review E,1999, 60(5).