@book{Eichfelder2015, author = {Eichfelder, Sebastian and Hechtner, Frank and Hundsdoerfer, Jochen}, year = {2015}, language = {eng}, copyright = {http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen}, title = {Formula apportionment}, url = "http://dx.doi.org/10.17169/refubium-23443", }