@incollection{Nowakowski2017, author = {Nowakowski, Dominik}, year = {2017}, language = {ger}, copyright = {http://creativecommons.org/licenses/by-nc/3.0/}, title = {Mittelalterliche Doppelburgen in Polen}, url = "http://dx.doi.org/10.17169/refubium-196", }