I'm quite surprised by the fact that this question hasn't appeared before (or I just couldn't find one), because the situation looks very common to me.
Namely, I have to cite an article, but since it is written in Russian, I also want to supply a link to the English translation on arXiv. Of course, it is possible to add a comment to the end of the entry, like "~paper info~ (in Russian, see English translation at arXiv:~number~)", but this looks not very good to me.
Is it possible to place two article in one BibTeX entry? If not, what is the suitable bibliography package to do it?