You can suggest a publication to be purchased by the library – particularly if the publication you need is recent.

http://www.fu-berlin.de/sites/ub/literatursuche/fernleihe/kaufvorschlag/index.html

Suggestions can be addressed to the University Library or to a department library. A reply will be given by e-mail. If the publication is purchased, it can be delivered directly to the circulation desk, according to your request.

The form is integrated in Library Portal Primo. Please login first and an make sure, the library does not own the book. Then click "Submit a purchase suggestion".