@phdthesis{oai:tsukuba.repo.nii.ac.jp:00021067,
 author = {貞本, 晃 and Sadamoto, Akira},
 month = {},
 note = {1993},
 school = {筑波大学, University of Tsukuba},
 title = {高次モード波を含む円形ダクト内音波の伝ぱ特性と消音に関する研究},
 year = {1994}
}