@book{Dupper2014,
author = {Dupper, Ockert},
year = {2014},
language = {eng},
copyright = {http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen},
title = {Coordination of Social Security Schemes},
url = "http://dx.doi.org/10.17169/refubium-23066",
}