@incollection{2019:seyfert:einleitend,
title = {Einleitende Bemerkungen},
year = {2019},
note = {},
booktitle = {Beziehungsweisen},
pages = {9--17},
edition = {1},
author = {Seyfert, Robert},
publisher = {Velbrück Wissenschaft},
address = {Weilerswist},
series = {},
volume = {}
}