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)
Katayama,Global and almost-global existence for systems of nonlinear wave equations with different propagation speeds,Differential Integral Equations,,,2004,17,,1043,https://cir.nii.ac.jp/crid/1371977244074899723,