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
"Dumortier, Freddy and Roussarie, Robert H. and Sotomayor, Jorge and Żoładek, Henryk",Bifurcations of planar vector fields : nilpotent singularities and Abelian integrals,,Springer-Verlag,1991,Lecture notes in mathematics,,"3540545212,0387545212",,https://cir.nii.ac.jp/crid/1130000794773187968