@phdthesis{oai:tsukuba.repo.nii.ac.jp:00008714,
 author = {Yamamoto, Hiroki and 山本, 広樹},
 month = {},
 note = {2003, Includes bibliographical references},
 school = {筑波大学, University of Tsukuba},
 title = {Quaternion signal representation and its application to instrumentation},
 year = {2004}
}