the technic from Takens is close from the search of strange attractors
http://books.google.fr/books?id=GNZvIw47Nu0C&pg=PA20&lpg=PA20&dq=diks+nonlinear+time+series+analysis&source=bl&ots=tKTZSRGr6C&sig=WJbNhCYPw8h2jF0apzwKkyy39-I&hl=fr&sa=X&ei=9DXtU8HuK6-a1AWA84CgAg&ved=0CDwQ6AEwBDgK#v=onepage&q=diks%20nonlinear%20time%20series%20analysis&f=false
