Zotero doesn't automatically download the PDF for this site
Clicking on Zotero's address bar icon for this page (http://www.springerlink.com/content/p632q51571711540/) does not cause the PDF to be downloaded like with most other sites.
http://www.zotero.org/support/known_translator_issues
there's currently nothing we can do about springerlink, we'd love to fix that translator, but the way they server their metadata doesn't allow it.