@misc{indiciaeefc6909a3d90,
  title = {Controlling air traffic with touch sensitive screen.},
  author = {K P Gäertner and K P Holzhausen},
  year = {1980},
  doi = {10.1016/0003-6870(80)90116-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/15676370/},
  note = {Source identifier: 15676370}
}