Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) LIN YJ,Characteristics of virtual unipolar electrograms for detecting isthmus block during radiofrequency catheter ablation of typical atrial flutter,J Am Coll Cardiol,,,2004,43,,2300-2304,https://cir.nii.ac.jp/crid/1574231875590676992,