@techreport{oai:tsukuba.repo.nii.ac.jp:00022666,
 author = {大澤, 義明 and OSAWA, Yoshiaki and Kobayashi, Takafumi},
 month = {},
 note = {Includes bibliographical references},
 title = {Analytical model of visibility of a landmark},
 year = {2003},
 yomi = {オオサワ, ヨシアキ}
}