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)
Roger D. Nussbaum,"Periodic solutions of some nonlinear, autonomous functional differential equations. II",Journal of Differential Equations,0022-0396,Elsevier BV,1973-09,14,2,360-394,https://cir.nii.ac.jp/crid/1363951793358846848,https://doi.org/10.1016/0022-0396(73)90053-3