Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) "山田, 明彦",A large signal theory of electron beam in resonant cavities with non-uniform field and large transit angle,Proceedings of the Fujihara Memorial Faculty of Engineering Keio University,,慶応義塾大学藤原記念工学部,1964,17,66,74(30)-74(30),https://cir.nii.ac.jp/crid/1050564288904197632,