@misc{indiciaec77456fbe3f4,
  title = {A study of navigation in virtual space},
  author = {Darken, Rudy and Sibert, John L. and Shumaker, Randy},
  year = {1994},
  url = {https://ntrs.nasa.gov/citations/19940029520},
  note = {Source identifier: 19940029520}
}