@article{MET_1977__24_175707,
     author = {D.R. Jensen},
     title = {On {Approximating} the {Distributions} of {Friedman's} xr2 and {Related} {Statistics.}},
     journal = {Metrika},
     pages = {75--86},
     publisher = {mathdoc},
     volume = {24},
     year = {1977},
     zbl = {0365.62041},
     url = {http://geodesic.mathdoc.fr/item/MET_1977__24_175707/}
}