@misc{indiciaed9d61f28e66e,
  title = {Graphical interfaces for cooperative planning systems},
  author = {Smith, Philip J. and Layton, Chuck and Mccoy, C. Elaine},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910001643},
  note = {Source identifier: 19910001643}
}