I have switched over the Nominal Bibliography from using Zotero to CiteULike. I believe, with a few exceptions, that the Nominal Group on CiteULike now references every publication that’s connected to “nominal techniques” (whatever they may be!). The exceptions are some papers of M. J. Gabbay, which will be added shortly.
If you know of any more nominal papers, please let me know! I will attempt to keep this up-to-date.