BibTex format
@article{Newson:2004:10.1177/1536867X0400400411,
author = {Newson, R},
doi = {10.1177/1536867X0400400411},
journal = {STATA JOURNAL},
pages = {484--485},
title = {Stata tip 13: generate and replace use the current sort order},
url = {http://dx.doi.org/10.1177/1536867X0400400411},
volume = {4},
year = {2004}
}