EU-Accession States

The accession member states of the European Union are those, who joined on April 16, 2003. These are

Czech Republic
Estonia
Hungary
Latvia
Lithuania
Malta
Poland
Slovak Republic
Slovenia
These citizens are now full members of the Union and are not subject to any entry or work permit restrictions anymore.

However, Bosnians, Bulgarians, Romanians and Serbs are not yet fully integrated into Europe. They still need to apply for a work permit from home. This remains true even if they do not need a visa to enter Schengen Area for touristic reasons.
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Additional information