@book{Westerhoff+2019,
url = {https://doi.org/10.3790/9783428471751},
title = {Die Elemente des Beweglichen Systems},
title = {},
author = {Rudolf Westerhoff},
publisher = {Duncker & Humblot},
address = {},
doi = {doi:10.3790/9783428471751},
isbn = {9783428471751},
year = {1991},
lastchecked = {2019}
}