@book{Schimmelfennig2016,
author = {Schimmelfennig, Frank},
year = {2016},
language = {eng},
copyright = {http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen},
title = {Graded Membership in the European Union},
url = "http://dx.doi.org/10.17169/refubium-21532",
}