@article{oai:repository.dl.itc.u-tokyo.ac.jp:00017947,
 author = {Thorpe, Charles},
 issue = {7},
 journal = {生産研究},
 month = {Jul},
 pages = {601--601},
 title = {Perception for Outdoor Navigation on Highways, Cross-Country, and in the Air},
 volume = {51},
 year = {1999}
}