@book{Martens+2021,
url = {https://doi.org/10.3790/9783428466122},
title = {Die Besteuerung wirtschaftlicher Aktivitäten im Amateursport},
title = {},
author = {Jörg Martens},
publisher = {Duncker & Humblot},
address = {},
doi = {doi:10.3790/9783428466122},
isbn = {9783428466122},
year = {1989},
lastchecked = {2021}
}