@book{Polugodina2020, author = {Polugodina, Maria and Grigoriadis, Theocharis}, year = {2020}, language = {eng}, copyright = {http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen}, title = {East Prussia 2.0}, url = "http://dx.doi.org/10.17169/refubium-26889", }