Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Sakuraba I,The heltron waves on an E-type filamentary electron beam,"Memoirs of the Faculty of Engineering, Hokkaido University",03689379,Sapporo : Faculty of Engineering,1963-03,11,4,????,https://cir.nii.ac.jp/crid/1520853833816561664,