Citing an article under a double-blind review process
Considering the following extreme case can help to clarify: what will you do if article B is accepted before article A finishes peer review?  This could easily happen, given the high variability in time in review cycle and number of reviews.

At that point you've got basically two options:


Drop the references.  Can your paper survive without them?  If so, it's not a big deal.
Put your blind review article into a pre-print archive, in order for it to be available.  This might "spoil" the blind review process, but only if the reviewers go looking for it and only if it significantly changes their opinion.


In the mean time, I would recommend citing it as "[omitted due to ongoing blind review; available on request]", and letting the reviewers request through the editor if they feel reading your pre-print article is important.