On Devaney's definition of chaos. Banks, J., Brooks, J., Cairns, G., Davis, G., & Stacey, P. Amer. Math. Monthly, 99(4):332--334, 1992.
On Devaney's definition of chaos [link]Paper  doi  bibtex   
@article{BanBroCai92,
	Author = {Banks, J. and Brooks, J. and Cairns, G. and Davis, G. and Stacey, P.},
	Coden = {AMMYAE},
	Date-Modified = {2016-02-18 11:56:35 +0000},
	Doi = {10.2307/2324899},
	Fjournal = {The American Mathematical Monthly},
	Issn = {0002-9890},
	Journal = {Amer. Math. Monthly},
	Mrclass = {54H20 (58F13)},
	Mrnumber = {1157223 (93d:54059)},
	Mrreviewer = {J. E. Keesling},
	Number = {4},
	Pages = {332--334},
	Title = {On {D}evaney's definition of chaos},
	Url = {http://dx.doi.org/10.2307/2324899},
	Volume = {99},
	Year = {1992},
	Bdsk-Url-1 = {http://dx.doi.org/10.2307/2324899}}
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