著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) YOKOYAMA H.,Self-sustained oscillations with acoustic feedback in flow over a backward-facing step witha small upstream step,Physics of Fluids,,,2007,19,,106104,https://cir.nii.ac.jp/crid/1570009751561450624,