BibTex format
@article{Newson:2002:10.1177/1536867X0200200103,
author = {Newson, R},
doi = {10.1177/1536867X0200200103},
journal = {STATA JOURNAL},
pages = {45--64},
title = {Parameters behind "nonparametric" statistics: Kendall's tau, Somers' D and median differences},
url = {http://dx.doi.org/10.1177/1536867X0200200103},
volume = {2},
year = {2002}
}