Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Arata Yoshiaki and Miyake Shoji and Abe Nobuyuki and Kishimoto Hiroaki and Agawa Yoshiaki and Kawai Yoshinobu,"ECR Plasma in a High Power Millimeter-Wave Beam (Report II) : Time Variation of Electron Density(Welding Physics, Process & Instrument)",Transactions of JWRI,0387-4508,Welding Research Institute of Osaka University,1985-12,14,2,241-246,https://cir.nii.ac.jp/crid/1572824502455871232,