@misc{indiciaea9abda1812cc,
  title = {[The Aachen liaison model]},
  author = {Ernst Richard Petzold and Guido Flatten and Dieter Wälte and Friedebert Kröger},
  year = {1999},
  url = {https://pubmed.ncbi.nlm.nih.gov/11781888/},
  note = {Source identifier: 11781888}
}