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)
TAKAHASHI H.,An approximate solution for the steiner problem in graphs,Math. Japonica.,,,1990,6,,573-577,https://cir.nii.ac.jp/crid/1572824500472548736,