@misc{OPUS4-28472,
  title     = {DGaaE-Nachrichten : Jahrgang 23 (2009), Heft 1},
  booktitle = {DGaaE-Nachrichten},
  volume    = {23},
  number    = {1},
  issn      = {0931-4873},
  type      = {periodicalpart},
  pages     = {1 -- 56},
  year        = {2009},
}