Academic tradition requires you to cite works you base your article on.
If you use programs that use GNU Parallel to process data for an article in a
scientific publication, please cite:

  Tange, O. (2023, January 22). GNU Parallel 20230122 ('Bolsonaristas').
  Zenodo. https://doi.org/10.5281/zenodo.7558957

This helps funding further development; AND IT WON'T COST YOU A CENT.
If you pay 10000 EUR you should feel free to use GNU Parallel without citing.

More about funding GNU Parallel and the citation notice:
https://www.gnu.org/software/parallel/parallel_design.html#citation-notice

To silence this citation notice: run 'parallel --citation' once.

Come on: You have run parallel 38 times. Isn't it about time
you run 'parallel --citation' once to silence the citation notice?