著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL
"Toft, Bjarne",Some contributions to the theory of coluor-critical graphs,,Matematisk Institut Aarhus Univ.,1970,Various publications series,,,,https://cir.nii.ac.jp/crid/1130000796521161856