@article {welch_robust_1988,
	title = {Robust permutation tests for matched-pairs designs},
	journal = {Journal of the American Statistical Association},
	volume = {83},
	number = {402},
	year = {1988},
	pages = {450{\textendash}455},
	url = {http://amstat.tandfonline.com/doi/abs/10.1080/01621459.1988.10478616},
	author = {Welch, William J. and Gutierrez, Leopoldo G.}
}
