Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Miwa Hirofumi and Kobayashi Shoichi and Tabuchi Tetsuo and Takamoto Toshihiko,First and second degree A-V block secondary to concealed conduction of junctional premature beats,Shinzo,0586-4488,Japan Heart Foundation,1976,8,6,628-633,https://cir.nii.ac.jp/crid/1390282680467261056,https://doi.org/10.11281/shinzo1969.8.6_628