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"European Commission"(PDF). Official Journal of the European Union. 18 November 2009. Archived(PDF) from the original on 25 January 2012. Retrieved 30 June 2011.
"Robert Nozick's Political Philosophy". Stanford Encyclopedia of Philosophy. Metaphysics Research Lab, Stanford University. 2018. Archived from the original on 10 December 2021. Retrieved 18 December 2021.