@misc{indiciaedaae11c10528,
  title = {Functional description of a command and control language tutor},
  author = {Elke, David R. and Seamster, Thomas L. and Truszkowski, Walter},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19900016251},
  note = {Source identifier: 19900016251}
}