著者名,タイトル,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI)
Krein,On the transfer function of a one-dimensional boundary problem of the second order,Doklady Akad. Nauk SSSR (N. S.),,,1953,88,,405,https://cir.nii.ac.jp/crid/1370857593773178117,