@incollection{2020:barth:a_einfh,
title = {A. Einführung in den Problembereich},
year = {2020},
note = {},
booktitle = {Der Kampf um die Werbung im Internet},
pages = {23--39},
edition = {1},
author = {Barth, Günter},
publisher = {Nomos},
address = {Baden-Baden},
series = {Recht der Informationsgesellschaft},
volume = {46}
}