@book{2015,
url = {https://doi.org/10.3790/9783428499700},
title = {Perspektiven der Systemforschung},
title = {},
author = {},
publisher = {Duncker & Humblot},
address = {},
doi = {doi:10.3790/9783428499700},
isbn = {9783428499700},
year = {1999},
lastchecked = {2015}
}