@book{Leuffen2013Diffe-20804,
  year={2013},
  isbn={978-0-230-24644-7},
  publisher={Basingstoke : Palgrave Macmillan},
  title={Differentiated Integration : Explaining Variation in the European Union},
  author={Leuffen, Dirk and Rittberger, Berthold and Schimmelfennig, Frank}
}

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