@book{6797,
	author = {Katok, A. B. and Hasselblatt, Boris.},
	title = {Introduction to the modern theory of dynamical systems /},
	publisher = {Cambridge University Press,},
	year = {1995.},
	address = {Cambridge ;},
	url = {http://www.loc.gov/catdir/description/cam026/94026547.html}
}