Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) NAKAGAWA H,Role of the tricuspid annulus and the Eustachian valve/ridge on atrial flutter : Relevance to catheter ablation of the septal isthmus and a new technique for rapid identification of ablation success,Circulation,,,1996,94,,407-424,https://cir.nii.ac.jp/crid/1570572700703613312,