@book{Gerhards2018, author = {Gerhards, Jürgen and Lengfeld, Holger and Ignácz, Zsófia S. and Kley, Florian K. and Priem, Maximilian}, year = {2018}, language = {eng}, copyright = {http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen}, title = {How Strong is European Solidarity?}, url = "http://dx.doi.org/10.17169/refubium-504", }