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@article{Authenticus:P-002-377,
	title = {{The extremal index, hitting time statistics and periodicity}},
	author = {ACM Moreira Freitas and JM Freitas and M Todd},
	doi = {10.1016/j.aim.2012.07.029},
	journal = {Advances in Mathematics},
	number = {5},
	pages = {2626-2665},
	publisher = {Academic Press Inc Elsevier Science},
	type = {Article},
	volume = {231},
	year = {2012}
}