When using programs that use GNU Parallel to process data for publication please cite:

@article{Tange2011a,
 title = {GNU Parallel - The Command-Line Power Tool},
 author = {O. Tange},
 address = {Frederiksberg, Denmark},
 journal = {;login: The USENIX Magazine},
 month = {Feb},
 number = {1},
 volume = {36},
 url = {http://www.gnu.org/s/parallel},
 year = {2011},
 pages = {42-47}
}

(Feel free to use \nocite{Tange2011a})

Or:

  O. Tange (2011): GNU Parallel - The Command-Line Power Tool, 
  ;login: The USENIX Magazine, February 2011:42-47.

This helps funding further development.