Paper  bibtex   

@article{Schwill1994,
  author    = {Schwill, Andreas},
  title     = {{Fundamental Ideas of Computer Science}},
  journal   = {EATCS-Bulletin},
  pages     = {274--295},
  year      = 1994,
  number    = 53,
  url={https://is.gd/6qtwH2},
  annote = {http://www.didaktik.cs.uni-potsdam.de/Forschung/Schriften/EATCS.pdf},
  urldate={2016-06-26},
}