Add citation recommendation

[george-gca]

When finding a paper or code, it is nice to be able to cite it properly, specially if a latex bib style is presented, so citation should be a must.

A regular problem is that usually the citation people tend to provide is to arxiv papers. Don't get me wrong, arxiv definitely is essential, but providing a citation to a conference paper helps assure that the paper passed the criteria to get properly published somewhere.