@misc{indiciae1b1de2d8cbc4,
  title = {Hierarchical modelling of mobile, seeing robots},
  author = {Luh, Cheng-Jye and Zeigler, Bernard P.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910035861},
  note = {Source identifier: 19910035861}
}