AEIplus is a sophisticated search engine which simultaneously searches the following:

• Archive of European Integration (AEI), an online archive and repository which collects and uploads two types of materials on the topic of European integration: independently-produced research materials, such as working or policy papers, conference papers, etc.; official European Union (EU) government documents not available in electronic format on EU databasesl
• European Research Paper Archives (ERPA), a search engine providing simultaneous access to independently-produced research materials posted on several separate websites.

Searches on AEIplus produce results as though all papers in both the AEI and ERPA were in one database. Alternative options for searching the AEI and ERPA archives are to use their respective search interfaces located here for AEI and here for ERPA. In some cases these native search options permit more detailed searching.