@book{Keuth+2019,
url = {https://doi.org/10.3790/9783428426935},
title = {Zur Logik der Normen},
title = {},
author = {Hans Herbert Keuth},
publisher = {Duncker & Humblot},
address = {},
doi = {doi:10.3790/9783428426935},
isbn = {9783428426935},
year = {1972},
lastchecked = {2019}
}