At work (where nobody ever authors scientific papers) we've just upgraded GNU parallel and I've had people complain to me about the large BibTeX notice.
This patch adds the ability to disable this notice on a site-wide basis, further info in the commit message: https://github.com/avar/parallel/compare/master...add-ability-to-quiet-bibtex-site-wide https://github.com/avar/parallel/compare/master...add-ability-to-quiet-bibtex-site-wide.patch The latter URL can be wget'ed and applied with "git am".
