@article{CharlesSchalk,
  author    = {Oliver Charles and Markus Schalk},
  title     = {Techniken zur Beschreibung von Software-Anforderungen technischer Systeme},
  series = {informatikJournal},
  volume    = {2009},
  isbn      = {978-3-00-029375-7},
  pages     = {5 -- 17},
  language  = {de}
}