@misc{indiciaef55199ff420f,
  title = {Combining qualitative and quantitative spatial and temporal information in a hierarchical structure: Approximate reasoning for plan execution monitoring},
  author = {Hoebel, Louis J.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930022943},
  note = {Source identifier: 19930022943}
}