@article {bajorski1999nonparametric,
	title = {Nonparametric two-sample comparisons of changes on ordinal responses},
	journal = {Journal of the American Statistical Association},
	volume = {94},
	number = {447},
	year = {1999},
	pages = {970{\textendash}978},
	publisher = {Taylor \& Francis},
	author = {Bajorski, Peter and Petkau, A.John}
}
