Statistical power analysis. Cohen, J. Current directions in psychological science, 1(3):98–101, 1992.
Statistical power analysis [link]Paper  bibtex   
@article{cohen_statistical_1992,
	title = {Statistical power analysis},
	volume = {1},
	url = {http://www.jstor.org/stable/10.2307/20182143},
	number = {3},
	urldate = {2013-09-20},
	journal = {Current directions in psychological science},
	author = {Cohen, Jacob},
	year = {1992},
	pages = {98--101}
}

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