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) C. Lekkeikerker and J. Boland,Representation of a finite graph by a set of intervals on the real line,Fundamenta Mathematicae,0016-2736,"Institute of Mathematics, Polish Academy of Sciences",1962,51,1,45-64,https://cir.nii.ac.jp/crid/1360011144748195968,https://doi.org/10.4064/fm-51-1-45-64