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) Takeshi Tokuyama and Naoki Katoh,Lovasz's lemma for the three-dimensional K-level of concave surfaces and its applications,40th Annual Symposium on Foundations of Computer Science (Cat. No.99CB37039),,IEEE Comput. Soc,2003-01-20,,,389-398,https://cir.nii.ac.jp/crid/1870020693015772032,https://doi.org/10.1109/sffcs.1999.814610