Cite paper under review on a paper that is going to double-blind review? I wrote a paper to a journal, which is still under review. Now I need to cite it in another paper that is double-blinded. Is this a problem?
Typically, there are two ways to cite yourself in a double-blind paper:


Cite the paper as though it were written by somebody else
Blank the information in the citation (e.g., "Blinded paper currently in review")


You should use the first whenever possible, since it is more informative and allows the reviewer to consult the reference.  The second case is used when it cannot apply and maintain blinding, like citing the conference version of a paper in an extended version for a journal.  Your case is another good example: the paper is under review and so cannot be read by the reviewers in any case, so blanking the citation is fine.  The article formatting guidelines may even give you a specific preferred method for doing so.