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
"Ortega, Rafael",Periodic differential equations in the plane : a topological perspective,,De Gruyter,2019,De Gruyter series in nonlinear analysis and applications,,9783110550405,,https://cir.nii.ac.jp/crid/1130282271930568064