BibTeX

@article{lacalle-hierarchical,
  author = {Alvarez-Lacalle, E. and Dorow, B. and Eckmann, J. P. and Moses, E.
	},
  title = {Hierarchical structures induce long-range dynamical correlations
	in wr itten texts},
  journal = {Proceedings of the National Academy of Sciences of the United States
	of America (PNAS)},
  year = {2006},
  volume = {103},
  pages = {7956-7961},
  number = {21},
  month = {May 23}
}