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 "Loud, W. S. (Warren Simms)",Periodic solutions of perturbed second-order autonomous equations,,American Mathematical Society,1964,Memoirs of the American Mathematical Society,,,,https://cir.nii.ac.jp/crid/1130282270250016384