Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) HIGGINS CB,Direct myocardial effects of intracoronary administration of new contrast materials with low osmolality,Invest Radiol,,,1980,15,,39-46,https://cir.nii.ac.jp/crid/1573105975488221440,https://doi.org/10.1097/00004424-198001000-00007