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 "Levi, Mark",Qualitative analysis of the periodically forced relaxation oscillations,,American Mathematical Society,1981,Memoirs of the American Mathematical Society,,0821822446,,https://cir.nii.ac.jp/crid/1130000795232288896